Abstract: An improved, personal, submersible marine vehicle with a fluid-tight elongated hull having an open back and a removable cover. Within the hull is a battery compartment. A shrouded propeller and motor depend from the hull. A dense, rigid cellular foam section fills substantially all of the air space in the hull and surrounds the battery compartment. Electrical speed control means for the motor are embedded in the foam section so that the battery is shielded from contact with any source of spark in the electrical control means. Further, the foam section provides a substantially greater effective hull thickness than the actual thickness of the hull so that the vehicle can be safely used at far greater depths. Also, the foam section renders the vehicle substantially leak-proof.

Abstract: A submersible marine vehicle, operable both upon and beneath water, includes a fluid-tight hull elongated along a longitudinal axis corresponding to an intended direction of travel of the vehicle, the hull having integral gripping elements and velocity controls proximal to each of the gripping elements, the hull further including internally energy storage elements for power control and transfer within an air space in the hull, the air space also defining a buoyancy characteristic of the vehicle, the hull defining a total longitudinal dimension co-linear to the longitudinal axis of the hull. The vehicle also includes a single circumferentially integral propeller shroud depending integrally downwardly from a lower surface of the hull along an axis transverse to the axis of the hull.