The Maxwell sub is 1 atm the sub is 5' in dia. was tested to 66' with
a normal dive deep of only 30' is constructed with two #6 dished and flanged
heads. the bottom is 1/2" the top 5/16"the side shell is made of 10" by
1/4" steel plate there are two tower hatches with a acrylic dome on each. the
ballast tank run from top to bottom front and rear of the hull 16" x1/4" there
are two elec. motors one on each side.
The Aquasub is the one that was in Mechanix ILLustrated soom years back it
only would go to 6' however you remain dry.
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