I have collided with submerged wreck.

我船与水下沉船相碰。

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You are running into danger. Submerged wreck ahead of you.

你船正驶向危险，你船前方有水下沉船。

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For some wreck interior shots, a set was constructed and submerged.

为了拍摄残骸内部镜头，建了一个基地，后来被水淹没了。

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Once upright, more caissons will be attached to the side that had been submerged, and the water in them will then be replaced with air to give buoyancy and allow the wreck to be towed away.

BBC: Salvaging the Costa Concordia