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I was reading an old Salvage Operations book which was printed in 1944 and thought I would share this with the list. I should note not that there is not anything new here, but even back in 1944 they knew air was not the correct gas to use when conducting deep dive operations (working or observing). "The use of helium in diving is still in its early stages. While it has been used with some success, the use of normal air in diving for most commercial and many naval operations remains general even though work in extremely deep water results in a high incidence of the bends. Yet diving to depths greater than 225 feet for the purpose of completing emergency salvage work or military observations is far too dangerous when divers are supplied with straight air. The combination of carbon dioxide and nitrogen narcosis impairs coordination of nerves and muscles to such an extent that the simplest assignment can be completed by a diver only with the greatest of difficulty. Divers working at these depths often suffer lapse of memory and loss of consciousness." This is such old news and yet the debates continue. Patrick -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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