Rachel Lance lacked access to the actual submarine (which I think is too bad as she also is searching for answers) so she used a scale model of the Hunley. She first used compressed gas at first to simulate an explosion. Then she used scaled down black powder.
She placed her scale model in a pond and measured the pressure inside and outside of it when the explosion took place.
Water transmits blasts well. Sadly, the Hunley had a very thin hull, unlike today's submarines.
This proved fatal to the Hunley's crew according to her research.
--Old B-R'er
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