Submarines & Diving playlist: https://www.youtube.com/playlist?list=PL1C388CF94E3C0F45
more at http://quickfound.net
Produced by the Bureau of Aeronautics Photographic Science Laboratory for the Bureau of Naval Personnel. Technical supervision by The Deep Sea Diving School, Washington Navy Yard.
This film covers procedures for deep sea divers. Other training films cover the diving suit itself. The total weight of the standard diving gear is 190 pounds.
US Navy training film MN-105c
Originally a public domain film from the US Navy, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
also see "Assembling the Deep Sea Suit" (1963)
The DESCO Mark V diving helmet has been in continuous production since 1942. As of 2012, it (helmet only) sells for $6,050. https://www.divedesco.com/catalog/product_info.php?cPath=22&products_id=162&osCsid=om4ughnnihk92si5of514djtd5
from US Navy Diving Manual Rev. 6
MK V Deep-Sea Diving Dress.
By 1905, the Bureau of Construction and Repair had designed the MK V Diving Helmet which seemed to address many of the problems encountered in diving. This deep-sea outfit was designed for extensive, rugged diving work and provided the diver maximum physical protection and some maneuverability.
The 1905 MK V Diving Helmet had an elbow inlet with a safety valve that allowed air to enter the helmet, but not to escape back up the umbilical if the air supply were interrupted. Air was expelled from the helmet through an exhaust valve on the right side, below the port. The exhaust valve was vented toward the rear of the helmet to prevent escaping bubbles from interfering with the diver's field of vision.
By 1916, several improvements had been made to the helmet, including a rudimentary communications system via a telephone cable and a regulating valve operated by an interior push button. The regulating valve allowed some control of the atmospheric pressure. A supplementary relief valve, known as the spitcock, was added to the left side of the helmet. A safety catch was also incorporated to keep the helmet attached to the breast plate. The exhaust valve and the communications system were improved by 1927, and the weight of the helmet was decreased to be more comfortable for the diver.
After 1927, the MK V changed very little. It remained basically the same helmet used in salvage operations of the USS S-51 and USS S-4 in the mid-1920s. With its associated deep-sea dress and umbilical, the MK V was used for all submarine rescue and salvage work undertaken in peacetime and practically all salvage work undertaken during World War II. The MK V Diving Helmet was the standard U.S. Navy diving equipment until succeeded by the MK 12 Surface-Supplied Diving System (SSDS) in February 1980 (see Figure 1‑8). The MK 12 was replaced by the MK 21 in December 1993.