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Saw that video the other day, pretty funny stuff..
We're often reminded not to bring up wedges of "cheese" from the bottom. Torpex!I was diving with a friend of San Clemente Island. He came aboard with a goody bag with 5 bricks of C3 (older plastic explosive) tied together with det (detonation) cord and a dozen 50 caliber shells.
It was probably a failed shot because the det cord was less than 6'/2m long. Normally det cord runs from the explosive to a safe distance to a boat (or the island) where a blasting cap is attached. You have to be careful not to have tight bends in the det cord or the high velocity explosive (PETN) in the plastic tubing will blow apart instead of propagating to the charge.
We probably would have kept it if it were C4 instead of C3. Fortunately all the Composition Cs are very stable.
Insta-buddies