What is a 'medium pattern' of the depth charge? ‘Stand by for medium pattern.’ ‘Aye aye, sir.’ Nourse spoke into his mouthpiece. Krause gulped with excitement. The moment might be very close. It was always true of handling ships at sea that time seemed to move faster and faster as the crisis approached. Two minutes ago action seemed far off. Now Keeling might be dropping her depth charges at any second. Question: What is a 'medium pattern'? Does that mean the depth of the pattern? If so, how deep will the depth charge explode in this pattern?