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Show Investigate Submarine Explosion San Pedro, Cal. An Investigation to establish the cause of the explosion explo-sion on the submarine S-37,' which post the lives of three men and the Injury of five others, was under way Thursday on the mother ship Beaver, alongside the submarine squadron In the outer harbor here. The batteries were being charged when the xplo. slon occurred, and naval men general-ly general-ly expressed the unofficial opinion that a short circuit caused tbe ignition igni-tion of hydrogen gas. |