The trunk was separated at the waist into an upper and lower torso joined by a bolted flange. The upper torso contained the buoyancy tank and the arms. The top of the torso was provided with two unprotected air bottles to regulate buoyancy. At the end of each arm, which was composed of three ball and socket joints, there was originally mounted an artificial glove-like mechanism, that could be manipulated from inside the suit. This approach quickly proved to be impractical, as it was difficult to articulate and even at moderate depths it leaked excessively. Latter, the glove mechanism was replaced by a system of grippers (what we call today: end effectors). The legs, each also divided into three ball and socket joints, similar to the arms, were attached to the lower part of the trunk (lower torso).

The breathing provision for the diver was installed inside the trunk, as was the telephone and control system. The suit was provided with four view ports.