Patent ID: 8689720

Claim:
A mono hull vessel for retrieving and deploying equipments in offshore region comprising: a deck box with an upper deck at a top of the deck box, the upper deck comprising a lifting and lowering device; a hull at a base of said mono hull vessel, the hull being of a single-piece construction and comprising a platform for a lower deck, the hull being submersible and comprising a shape of a ship's hull; a plurality of columns connecting the hull to the deck box; a lifting device is disposed on the upper deck to allow lifting and lowering of equipment between the upper deck and the lower deck; wherein the lower deck of the mono hull vessel is adapted to submerge to and from a desired depth below a water level; wherein said plurality of columns are 4 to 10 in number; and wherein the mono hull vessel functions as a surface sailing vessel when in a non-submerged condition.