www.electroarc.com Here is a serious guaranteed solution. Melt your way through the bolt with an electric arc! Note this may be good if your ship is made of stainless steel. If fiberglass or carbon is nearby-- not so much! WHoooosh!
Dacarls: A-class USA 196, USA 21, H18, H16 "Nothing that's any good works by itself. You got to make the damn thing work"- Thomas Edison
