The "monumental" operation to re-float and remove the wrecked Costa Concordia cruise ship will start in the next few days.
The project is set to cost £190 million and to take up to a year to complete.
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The vessel went missing last week with 44 sailors on board.
Joined by 18 Labour MPs, McDonnell voted with 283 Conservatives, eight DUP and two independents to defeat the Taxation Bill amendment.
Gerry Adams has told UTV the “time is right” for him to step aside as president of Sinn Féin, after announcing that he would do so in 2018.