FROGMEN

demolition

"Scratch" One Obstruction

"Scratch it," that is, right off the list of underwater obstructions. The Frogmen, once more back in their rubber boats, watch a successful charge explode under water. Sometimes during exercises these charges are set off close to the men to get them used to the nearness of explosives of all types. Frogmen are experts with all sorts of explosives: how to set them for the most effective results, how to use all kinds of fuses, electrical detonators, and timing devices. They must know how to blast all sorts of materials, forms of obstructions, and types of underwater mines. The latter are made safe either by deactivating the firing mechanism, or by exploding with a charge attached to them by the Frogmen and exploded from a safe distance.

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