The Cousteau was a Federation Type 15 shuttlepod that was in service with Starfleet in the mid-24th century, attached to the USS Aries. It was shuttlepod 20.
In 2367, former USS Victory crew member Emilita Mendez, while serving aboard the Aries, came under the effects of an exotic virus from Tarchannen III. Mendez stole the shuttlepod Cousteau from the Aries to return to Tarchannen III. A search team from the USS Enterprise-D found the shuttle, but the only traces of Emilita Mendez were some exotic foot prints. (TNG: "Identity Crisis")