The coveralls are heavy nylon and is not waterproof, but the divers are wearing wetsuits underneath. There is a drysuit that has a neck ring that mates with this helmet, but these divers are using the simpler neck dam on these dives.
On this helmet, the air hose is yellow, and the black wire at the back of the helmet is communications. There is also another thinner yellow hose called a pneumo that is used to gauge the divers depth.
