Travocean tubes enable operators on the working deck to position mobile instruments under the ship. These tubes cross the various decks down to the keel. A composite mounting receives the instruments to be deployed under the ship. The mounting is maintained in position thanks to an air chamber inflated with compressed air.

The 800 mm diameter tubes (Pourquoi pas ?, Atalante) are indexed, the orientation of their lower section in relation to the fore-and-aft line of the ship always being identical.