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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_CashFlowsUsedInIncreaseInRestrictedCashAndCashEquivalents" xlink:label="loc_oet_CashFlowsUsedInIncreaseInRestrictedCashAndCashEquivalents" />
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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.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>
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<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="213800U35RCYXTKVEM65-2025-12-31.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>
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<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="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForAmortizationOfLoanFinancingFeesAndLoanModificationGain" xlink:label="loc_oet_AdjustmentsForAmortizationOfLoanFinancingFeesAndLoanModificationGain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForAmortizationOfLoanFinancingFeesAndLoanModificationGain" xml:lang="en">Adjustments For Amortization Of Loan Financing Fees And Loan Modification Gain</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForAmortizationOfLoanFinancingFeesAndLoanModificationGain" xml:lang="en">Adjustments for amortization of loan financing fees and loan modification gain.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.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>
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<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="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssetsAndNoncurrentAssets" xlink:label="loc_oet_AdjustmentsForDecreaseIncreaseInCurrentPrepaidExpensesAndOtherCurrentAssetsAndNoncurrentAssets" />
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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForDecreaseIncreaseInDueFromRelatedParties" xlink:label="loc_oet_AdjustmentsForDecreaseIncreaseInDueFromRelatedParties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInDueFromRelatedParties" xml:lang="en">Adjustments For Decrease Increase In Due From Related Parties</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForDecreaseIncreaseInDueFromRelatedParties" xml:lang="en">Adjustments for decrease increase in due from related parties.</label>
<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xlink:label="loc_oet_AdjustmentsForDecreaseIncreaseInTradeAccountReceivableAndAdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" />
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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForGainLossFromLoanModifications" xlink:label="loc_oet_AdjustmentsForGainLossFromLoanModifications" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForGainLossFromLoanModifications" xml:lang="en">Adjustments For Gain Loss From Loan Modifications</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_oet_AdjustmentsForGainLossFromLoanModifications" xml:lang="en">Adjustments For Gain Loss From Loan Modifications</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForGainLossFromLoanModifications" xml:lang="en">Adjustments for gain loss from loan modifications.</label>
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.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>
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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForIncreaseDecreaseInAccruedExpensesAndOtherCurrentLiabilities" xlink:label="loc_oet_AdjustmentsForIncreaseDecreaseInAccruedExpensesAndOtherCurrentLiabilities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForIncreaseDecreaseInAccruedExpensesAndOtherCurrentLiabilities" xml:lang="en">Adjustments For Increase Decrease In Accrued Expenses And Other Current Liabilities</label>
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<loc xlink:type="locator" xlink:href="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForIncreaseDecreaseInDueToRelatedParties" xlink:label="loc_oet_AdjustmentsForIncreaseDecreaseInDueToRelatedParties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForIncreaseDecreaseInDueToRelatedParties" xml:lang="en">Adjustments For Increase Decrease In Due To Related Parties</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForIncreaseDecreaseInDueToRelatedParties" xml:lang="en">Adjustments for increase decrease in due to related parties.</label>
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.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="213800U35RCYXTKVEM65-2025-12-31.xsd#oet_AdjustmentsForLossOnDebtExtinguishment" xlink:label="loc_oet_AdjustmentsForLossOnDebtExtinguishment" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_oet_AdjustmentsForLossOnDebtExtinguishment" xml:lang="en">Adjustments For Loss On Debt Extinguishment</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_oet_AdjustmentsForLossOnDebtExtinguishment" xml:lang="en">Adjustments for loss on debt extinguishment.</label>
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" xlink:label="loc_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" />
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<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.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>
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<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" />
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