This Seahorse II swimmer delivery vehicle is a submersible watercraft that was produced in the 1950s or 1960s by Costruzione Motoscafi Sottomarini (CosMoS) of Livorno, Italy. The company was founded in the 1950s by Italian military diver Sergio Pucciarini and produced a series of small submarines for military and civilian use. The Seahorse II was an evolution of earlier models, and the design utilized an electric motor linked to a single propeller. This example is said to have been featured in the 1965 James Bond film Thunderball after being fitted with a manta ray-style cowling to change its appearance. The shell is constructed of fiberglass with reinforcing strakes along the sides, and the interior can accommodate two occupants. The craft features a canopy structure with plexiglass panels as well as a rudder, a propeller guard, lifting rings, a steering wheel, and a depth gauge. Purchased by the current owner in 2024, this Seahorse II is now offered on dealer consignment in California with a rolling display cart and bill of sale.

Small “wet subs” with open cockpits were pioneered for military applications, and they were typically used for transporting limpet mines or other naval munitions to designated targets. The Seahorse II was introduced to the civilian market in the 1950s, and the US Navy later used them for training purposes. The fiberglass fuselage of this example is finished in gray with Navy-style stencil lettering, and a canopy structure with plexiglass panels is fitted over the cockpit. Lifting rings are positioned fore and aft, and other equipment includes a forward tow ring, side strakes, and a full keel. Some of the plexiglass panels are not secured in place, and checking is visible in the finish.

The interior is configured to accommodate a pilot and one passenger along with essential equipment such as breathing apparatus and emergency gear. A watertight compartment housed in the belly structure is designed to house lead-acid batteries. The steering wheel provides directional control via cables that rotate the rudder, and other features include a metal seat and a depth gauge. The control cables are not connected.

The vessel is equipped with a three-blade propeller, a rudder, and a propeller guard. A diving plane is not present.