Abstract: A recompression chamber is disclosed comprising a frusto-conical shell with an end wall closing the base of the shell and having a sealable hatch in the end wall to provide access to the chamber. The chamber may be tilted endwise to vary the position of the patient lying in the chamber. The chamber is dimensioned to accommodate a patient lying down with his feet towards the apex of the shell and an attending medical technician sitting adjacent the sealable hatch. The hatch is also provided with a rotatable bayonet fitting to enable a further chamber to be attached thereto to provide for a transfer under pressure between the chambers.