It would certainly seem from the physical evidence of where the Hunley was found in relationship to the Houstonic sinking would seem to indicate that the Hunley survived the blast of it own Torpedo.

From my two visits to the Hunley preservation in Charleston, from my personal observation, there did not appear to be any significant damage to the pressure hull of the Hunley that would have lead to its sinking other than the 3 inch hole that has been the subject of much conjecture as to how that damage occurred. From a musket bullet fired
from the deck of the Houstonic at the time of the attack to a depth charge attack during WW II by an American Destroyer when it picked up a sonar contact on the sea floor outside Charleston Harbor.

One of the interesting things at the Hunley preservation center exhibit when I was there last year. I was surprised to see was the display of one of the two Guns salvaged from the CSS Alabama off the coast of France. The other gun is in Mobile.