It is kept in a 75000 gallon tank filled with a solution of sodium-hydroxide (Draino) and has an electrical current running through it to remove 140 years of salt from the metal. Excavation of the hull located the remains of all eight crewmen and they were later given military funerals in Charleston.
Here are some photos taken of the HUNLEY at the Friends of the HUNLEY exhibit at the Lash Conservation Center.
A cutway model of the HUNLEY showing crew positions.

A sectional outline of the hull with dimensions

Port side forward as seen in the treatment tank

Ports side midships

Port side aft

The HUNELY is 40 feet long. You can see the hand cranks where the hull plates were removed. The explosive charge was 140lbs of black powder at the end of of a spar with a contact fuse.
Hope you enjoy them.