submarine armor

from The Collaborative International Dictionary of English v.0.48

Submarine \Sub`ma*rine"\, a.
   Being, acting, or growing, under water in the sea; as,
   submarine navigators; submarine plants.
   [1913 Webster]

   {Submarine armor}, a waterproof dress of strong material,
      having a helmet into which air for breathing is pumped
      through a tube leading from above the surface to enable a
      diver to remain under water.

   {Submarine cable}. See {Telegraph cable}, under {Telegraph}.
      

   {Submarine mine}. See {Torpedo}, 2
   (a) .
       [1913 Webster]