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  The miscellaneous problems of narcosis etc at depth are avoided by a
pressure-resisting armoured diving suit, as is well known, But such suits are
heavy and clumsy. But recently I saw a (UK) TV program about spacesuits, which
described 3 sorts of spacesuit:-
  (1) Loose and soft and pressurized, like the usual NASA suits.
  (2) Skintight, like in some old Buck Rogers comics; such suits exist and
were shown on the program.
  (3) Rigid armour with joints, `constant volume'. The version shown was of
some sort of very light (titanium?) metal alloy, and was astonishingly light
and agile.
  Since this is so, is there any chance of a very light agile sort of armoured
diving suit like a type 3 spacesuit being made, that the diver can swim with,
being made for use up to say a few hundred feet or a thousand or two? It would
have to fit the diver very closely, to avoid large air pockets that would have
to be counterbalanced with much heavy lead.

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