Semi-rigid craft, the buoyancy of which is adjustable

A semi-rigid craft having a bow and a stern and comprising a rigid hull consisting of a V-shaped bottom and a deck, on which a load can rest and which is accessible from the rear at a level which corresponds to a level of said deck, said craft comprising upper side walls consisting of pneumatic floats which join together at said bow, said floats being compartmentalized and rear float compartments at said stern being associated with inflation and deflation means in the form of three-way valves for varying the buoyancy of said craft, wherein said hull is a submergible hull, of which a central cavity, formed between said bottom and said deck, is open at the rear in order to be filled and emptied automatically, said central cavity extending from said stern for most of the length of said hull and containing at least one inflatable bag, said at least one inflatable bag being associated with inflation and deflation means enabling the buoyancy to be varied and consequently the level of immersion of said stern to be changed as needed, said central cavity of said hull being completely open at a rear part of said central cavity to allow introducing said at least one inflatable bag as well as introducing or draining water, and a front part of said central cavity being open by means of at least one opening made in said deck to allow the passage of air at least during inflation of said at least one bag.