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  <element id="hlx_BorrowingUnderRevolvingCreditFacility" name="BorrowingUnderRevolvingCreditFacility" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_CollarMember" name="CollarMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_GrantShareAmountMember" name="GrantShareAmountMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_GrantShareAmountBMember" name="GrantShareAmountBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_NextYearMember" name="NextYearMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_CapitalizedInterest" name="CapitalizedInterest" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_UndistributedEarningsReallocatedToParticipatingSecuritiesValue" name="UndistributedEarningsReallocatedToParticipatingSecuritiesValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_CurrentRemainingYearMember" name="CurrentRemainingYearMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_LiabilityLongTermIncentiveCompensationPlan" name="LiabilityLongTermIncentiveCompensationPlan" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_LiabilityLongTermIncentiveCompensationPlanVariablePortion" name="LiabilityLongTermIncentiveCompensationPlanVariablePortion" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_GrossProfitLossWithOtherOperatingSegmentsOfSameEntity" name="GrossProfitLossWithOtherOperatingSegmentsOfSameEntity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_EquityInEarningsOfAffiliates" name="EquityInEarningsOfAffiliates" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_FairValueByAssetClassDomain" name="FairValueByAssetClassDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_FairValueByLiabilityClassDomain" name="FairValueByLiabilityClassDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_OilAndGasActivitiesDisclosuresTextBlock" name="OilAndGasActivitiesDisclosuresTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_BrentMember" name="BrentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_OilContractsMember" name="OilContractsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ConvertibleSeniorNotesMaturingMarchTwoThousandAndThirtyTwoMember" name="ConvertibleSeniorNotesMaturingMarchTwoThousandAndThirtyTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ConvertibleSeniorNotesMaturingMarchTwoThousandAndTwentyFiveMember" name="ConvertibleSeniorNotesMaturingMarchTwoThousandAndTwentyFiveMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_TotalVolumeOfGasUnits" name="TotalVolumeOfGasUnits" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ComprehensiveIncomeLossAbstract" name="ComprehensiveIncomeLossAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ScheduleOfRedemptionPriceByMaturityTableTextBlock" name="ScheduleOfRedemptionPriceByMaturityTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_SeniorSecuredNotesRedemptionPriceInCurrentFiscalYear" name="SeniorSecuredNotesRedemptionPriceInCurrentFiscalYear" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_SeniorSecuredNotesRedemptionPriceInNextFiscalYear" name="SeniorSecuredNotesRedemptionPriceInNextFiscalYear" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_SeniorSecuredNotesRedemptionPriceInYearThreeAndThereafter" name="SeniorSecuredNotesRedemptionPriceInYearThreeAndThereafter" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_DebtInstrumentAnnualAmortizationOfPrincipal" name="DebtInstrumentAnnualAmortizationOfPrincipal" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_IntercompanySegmentProfitsTableTextBlock" name="IntercompanySegmentProfitsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ShareBasedPaymentAwardValue" name="ShareBasedPaymentAwardValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ConvertibleSeniorNotes2032Member" name="ConvertibleSeniorNotes2032Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_Debtinstrumentpercentageguaranteed" name="Debtinstrumentpercentageguaranteed" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_ConvertbileSeniorNotesSharesOfCommonStock" name="ConvertbileSeniorNotesSharesOfCommonStock" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_Issuanceofnotespercentage" name="Issuanceofnotespercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="hlx_Debtinstrumentconvertibleconversionpremiumpercentage" name="Debtinstrumentconvertibleconversionpremiumpercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xs:schema>
