Talk:Tenryuu/@comment-210.195.89.128-20131102125933/@comment-24210576-20131126154718

Also for some brownie points...

水雷 has historically referred to all underwater explosive ordinance used for surface combat, be it depth charges, torpedoes or sea mines. In the narrower context of Kancolle, it's as Silfumus says--it's a name used for any fleet elements utilizing torpedoes as its primary arsenal, i.e. CL + multiple DD groups.