User blog comment:D2r/Unanswered Questions of Redwall/@comment-1399757-20110213144312/@comment-1669318-20110214235754

There is a compost pile...or they could just have moles dig REALLY deep holes. On searat ship, the searats might clean it out every now and then, or make the slaves do it (they've got to go down there too). Salamandstaron has the sea.