Abstract: A recreational water craft useable as a vehicle and as a swimming facility has first and second floatable components, the first having a deck supported by a pair of compartmented pontoons. The compartments have water and air inlet and discharge facilities and are adapted for flooding and blowing by connection with a control system that includes a pressurized air source and valves for pressurizing and bleeding air from the compartments so as to move the first component between a first position with the deck above water and a second position with the deck submerged. The second floatable component has a main floatable section with an annular pontoon that rests on the deck during the vehicle mode of use as when the first component is at the first position. The pontoon has a vertical opening and which surrounds the deck passenger area. A floatable aft section is pivotally connected to the main section and provides a mounting place for an outboard motor.

Abstract: A shell fish cultivating and harvesting system utilizes a cultivating apparatus from which oyster cultch is suspended and which is equipped with pontoons having fore and aft compartments that are selectively blown and flooded to float and submerge the apparatus. Yieldable connections between certain components of the cultivating apparatus are used to avoid stress concentrations and the apparatus is designed to permit a shallow barge or harvesting apparatus to enter the space for the suspended oyster cultch when the apparatus is floating. The barge also utilizes spaced apart pontoons that have fore and aft compartments which may be similarly blown and flooded to change the buoyancy of the craft and thus permit it to submerge or float as the need arises.