head: Depth Charge - v.1
torso: Torpedo - v.4 (AKA:Chief Torpedo - v.1)
arms: Torpedo - v.4
legs: Torpedo - v.4

breathing unit:
chestplate: Torpedo- v.4
helmet: Sgt. Airborne/Copperhead disguise
hose: some cheap dollar store astronaut

Rather than reinvent or update, I felt Airtight would be better represented if I stayed as faithful to the original as possible. The breathing gear works great. Everything is removeable, and the hose is both flexible and durable.