An underwater vehicle is provided with facility for affixing to and maintaining station on a hull of another marine vehicle. The underwater vehicle includes a hull with a propulsion means for movement underwater. Maneuvering planes are mounted on the hull. Body panels are movably fixed to the hull and are moveable from first positions in which the panels conform to a shape of the hull to second positions in which the panels extend outwardly from the hull and toward the other marine vehicle, free edges of the panels being engageable with the other marine vehicle to deter flow of water between the underwater vehicle hull and the other marine vehicle and guide flow of water around the underwater vehicle hull to pin the underwater vehicle against the other marine vehicle hull.