A Starfleet shuttlecraft able to fly, float and dive, carried by the Enterprise and used to explore the ocean planet Argo in the animated series.
The aquashuttle is a specialised auxiliary craft with a boat-like hull, designed to land on water and operate beneath the surface. It appears in the animated episode The Ambergris Element.
Kirk, Spock, McCoy and Lieutenant Clayton take it down to Argo, a world almost entirely covered by sea, to study the quakes that drowned its land. A huge sur-snake attacks and wrecks the craft, dragging it under with Kirk and Spock aboard. When they are found days later they have been changed into water-breathers by the Aquans, the planet's hidden undersea people, and must win their trust and find the venom that will reverse the change.