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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_CapitalDistributionPerShare" xml:lang="en">Capital distribution per share.</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_CapitalDistributionClassifiedAsFinancingActivities" xml:lang="en">Capital distribution classified as financing activities.</label>
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<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:label="loc_ifrs-full_RepaymentsOfNoncurrentBorrowings" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" xml:lang="en">Repayments of non-current borrowings</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:to="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" />
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_CashAdvancesAndLoansMadeToRelatedPartiesAndCashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties" xlink:label="loc_oet_CashAdvancesAndLoansMadeToRelatedPartiesAndCashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_CashAdvancesAndLoansMadeToRelatedPartiesAndCashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties" xml:lang="en">Cash Advances And Loans Made To Related Parties And Cash Receipts From Repayment Of Advances And Loans Made To Related Parties</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_CashAdvancesAndLoansMadeToRelatedPartiesAndCashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties" xlink:to="lab_oet_CashAdvancesAndLoansMadeToRelatedPartiesAndCashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_CashAdvancesAndLoansMadeToRelatedPartiesAndCashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties" xml:lang="en">Cash advances and loans made to related parties and cash receipts from repayment of advances and loans made to related parties.</label>
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xml:lang="en">Cash flows from (used in) investing activities</label>
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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" xlink:label="loc_oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" xml:lang="en">Payments For Dry Dock Expenses Classified As Investing Activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" xml:lang="en">Payments For Dry Dock Expenses Classified As Investing Activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" xlink:to="lab_oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_PaymentsForDryDockExpensesClassifiedAsInvestingActivities" xml:lang="en">Payments for dry dock expenses classified as investing activities.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_PaymentsForVesselsAndVesselsUnderConstruction" xlink:label="loc_oet_PaymentsForVesselsAndVesselsUnderConstruction" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_PaymentsForVesselsAndVesselsUnderConstruction" xml:lang="en">Payments For Vessels And Vessels Under Construction</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_oet_PaymentsForVesselsAndVesselsUnderConstruction" xml:lang="en">Payments For Vessels And Vessels Under Construction</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_PaymentsForVesselsAndVesselsUnderConstruction" xlink:to="lab_oet_PaymentsForVesselsAndVesselsUnderConstruction" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_PaymentsForVesselsAndVesselsUnderConstruction" xml:lang="en">Payments for vessels and vessels under construction.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_ProceedsFromSalesOfShipsClassifiedAsInvestingActivities" xlink:label="loc_oet_ProceedsFromSalesOfShipsClassifiedAsInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_ProceedsFromSalesOfShipsClassifiedAsInvestingActivities" xml:lang="en">Proceeds From Sales Of Ships Classified As Investing Activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_ProceedsFromSalesOfShipsClassifiedAsInvestingActivities" xlink:to="lab_oet_ProceedsFromSalesOfShipsClassifiedAsInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_ProceedsFromSalesOfShipsClassifiedAsInvestingActivities" xml:lang="en">Proceeds from sales of ships classified as investing activities.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="loc_oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" xml:lang="en">Purchase Of Other Property Plant And Equipment And Intangible Assets Classified As Investing Activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" xml:lang="en">Purchase Of Other Property Plant And Equipment And Intangible Assets Classified As Investing Activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:to="lab_oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_PurchaseOfOtherPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities" xml:lang="en">Purchase of other property plant and equipment and intangible assets classified as investing activities.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForAmortisationOfLoanFinancingFees" xlink:label="loc_oet_AdjustmentsForAmortisationOfLoanFinancingFees" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForAmortisationOfLoanFinancingFees" xml:lang="en">Adjustments For Amortisation Of Loan Financing Fees</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForAmortisationOfLoanFinancingFees" xlink:to="lab_oet_AdjustmentsForAmortisationOfLoanFinancingFees" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForAmortisationOfLoanFinancingFees" xml:lang="en">Adjustments for amortisation of loan financing fees.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForCollectionsFromRelatedParties" xlink:label="loc_oet_AdjustmentsForCollectionsFromRelatedParties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForCollectionsFromRelatedParties" xml:lang="en">Adjustments For Collections From Related Parties</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForCollectionsFromRelatedParties" xlink:to="lab_oet_AdjustmentsForCollectionsFromRelatedParties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForCollectionsFromRelatedParties" xml:lang="en">Adjustments for collections from related parties.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForDecreaseIncreaseInCurrentClaimReceivables" xlink:label="loc_oet_AdjustmentsForDecreaseIncreaseInCurrentClaimReceivables" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInCurrentClaimReceivables" xml:lang="en">Adjustments for decrease (increase) in current claim receivables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForDecreaseIncreaseInCurrentClaimReceivables" xlink:to="lab_oet_AdjustmentsForDecreaseIncreaseInCurrentClaimReceivables" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInCurrentClaimReceivables" xml:lang="en">Adjustments for decrease (increase) in current claim receivables.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssets" xlink:label="loc_oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssets" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssets" xml:lang="en">Adjustments for decrease (increase) in current prepaid expenses and other current assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssets" xlink:to="lab_oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssets" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssets" xml:lang="en">Adjustments for decrease (increase) in current prepaid expenses and other current assets.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xlink:label="loc_oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xml:lang="en">Adjustments for decrease (increase) in trade account receivable and adjustments for decrease (increase) in other operating receivables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xlink:to="lab_oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xml:lang="en">Adjustments for decrease (increase) in trade account receivable and adjustments for decrease (increase) in other operating receivables.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForGainLossOnDisposalsShips" xlink:label="loc_oet_AdjustmentsForGainLossOnDisposalsShips" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForGainLossOnDisposalsShips" xml:lang="en">Adjustments for gain (loss) on disposals, ships</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_oet_AdjustmentsForGainLossOnDisposalsShips" xml:lang="en">Adjustments for (gain) loss on disposals, ships</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForGainLossOnDisposalsShips" xlink:to="lab_oet_AdjustmentsForGainLossOnDisposalsShips" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForGainLossOnDisposalsShips" xml:lang="en">Adjustments for gain (loss) on disposals, ships.</label>
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xlink:label="loc_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xml:lang="en">Adjustments for gains (losses) on change in fair value of derivatives</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xlink:to="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" />
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2023-12-31.xsd#oet_AdjustmentsForIncreaseDecreaseInAccrualsClassifiedAsCurrent" xlink:label="loc_oet_AdjustmentsForIncreaseDecreaseInAccrualsClassifiedAsCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForIncreaseDecreaseInAccrualsClassifiedAsCurrent" xml:lang="en">Adjustments for increase (decrease) in accruals classified as current</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_oet_AdjustmentsForIncreaseDecreaseInAccrualsClassifiedAsCurrent" xlink:to="lab_oet_AdjustmentsForIncreaseDecreaseInAccrualsClassifiedAsCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForIncreaseDecreaseInAccrualsClassifiedAsCurrent" xml:lang="en">Adjustments for increase (decrease) in accruals classified as current.</label>
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForInterestIncome" xlink:label="loc_ifrs-full_AdjustmentsForInterestIncome" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_AdjustmentsForInterestIncome" xml:lang="en">Adjustments for interest income</label>
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<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" xlink:label="loc_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" xml:lang="en">Adjustments to reconcile profit (loss) other than changes in working capital</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" xlink:to="lab_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:label="loc_ifrs-full_IncreaseDecreaseInWorkingCapital" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseInWorkingCapital" xml:lang="en">Increase (decrease) in working capital</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:to="lab_ifrs-full_IncreaseDecreaseInWorkingCapital" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xml:lang="en">Cash flows from (used in) operating activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xml:lang="en">Interest paid, classified as operating activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:to="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" />
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