Notes for the Mk VII Heavy depth charge:
Quote:
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The British claimed this DC would split a 0.875 inch (22 mm) hull at 20 feet (6.1 m) and force a submarine to surface at about twice that distance. A minol charge introduced in 1942 increased these distances to 26 feet (7.9 m) and 52 feet (15.8 m), respectively.
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http://www.navweaps.com/Weapons/WAMBR_ASW.htm
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