A Bangalore torpedo explodes, January 10 at Engineer Training Area 3. Marines used a manufactured Bangalore torpedo while learning the basics to preparing explosives and placing them. After reviewing the basics they moved on to expedient explosives, and then urban breaching. The main focus for Marines after getting down all the basics was learning how to use what’s around them for explosive charges, said Cpl. Rollie Lemons, of Austin, Texas, sapper instructor with 2nd CEB. - A Bangalore torpedo explodes, January 10 at Engineer Training Area 3. Marines used a manufactured Bangalore torpedo while learning the basics to preparing explosives and placing them. After reviewing the basics they moved on to expedient explosives, and then urban breaching. The main focus for Marines after getting down all the basics was learning how to use what’s around them for explosive charges, said Cpl. Rollie Lemons, of Austin, Texas, sapper instructor with 2nd CEB.