Used underwater, ammonia gelatin is a waterproof type of this explosive
Type of biological agents 
.... Semigelatin  Are similar to ammonia-granular, but have a small amount of ... 
other ingredients with blasting gelatin; is waterproof and used for underwater... [DOC] [TLE] GUNPOWDER [PAR] Gunpowder has also been used in things such as medicine and alchemy.