Beginner 8 minutes
Standard diving dress: a hundred years of the copper helmet
The suit that made it possible to work on the seafloor, and the disease that taught divers how to ascend
The copper helmet with round windows is the image almost everyone has of a diver. For more than a century, that's exactly what it was: if someone was working on the seafloor, they were wearing more than eighty kilos of suit and a hose that ran up to a man working a pump.
In this article you'll see how the classic diving dress worked, what problem it solved and which ones it created, why working in it produced the knowledge about decompression we still use today, and what remains of that system now.
Standard diving dress is the equipment with which much of the world's port infrastructure was built, and with which (through accidents) people learned how you have to ascend. The tables running inside your dive computer descend directly from it.
How the system worked
The principle is simple: a rigid helmet joined to a watertight suit, with air sent from the surface by a pump and a hose. Air enters continuously from above and exits through an adjustable valve, so there's always an atmosphere at water pressure inside the suit.
The version that became standard, developed in the first half of the nineteenth century and associated with the work of Augustus Siebe, joined the helmet and suit watertight, which let the diver work in any position without water getting in.
The equipment weighed enormously on the surface (helmet, breastplate, weighted boots and suit added up to a load that was hard to stand up under) and in the water that weight was offset by the air in the suit. Regulating that volume was the central skill of the trade: it was the buoyancy control of the era.
Communication worked through rope signals and, later, telephone. The surface crew was large: pump operators, an operation supervisor, and staff in charge of the line and the hose.
And the capabilities were real: divers worked for hours, handled tools, raised structures, and welded. For the first time, the seafloor was a place of sustained work, not one-minute visits.
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