one of the deepest depths possible to which a cargo ship may be loaded and itshullimmersed in water. Summer is the name of the Plimsoll mark on the side of a ship indicating a legally allowed depth (one of the deepest). It is called Indian Ocean Summer as laws regulating how much cargo a ship can carry have been known to not be well enforced in the Indian Ocean and thus Plimsoll markshave been falsified in order to carry more cargo and make more money. See also Plimsoll mark in this glossary.—9th ACC Volume 3 Approved Glossary