Icy Water
From WikiRaider
The Icy Water is first encountered in Tomb Raider III. In the level Antarctica Lara cannot stay in the freezing water for long. Once she gets in contact with the water a new bar will appear that will show Lara's body temperature, once it's depleted, Lara will rapidly die. This body temperature bar will slowly rise when Lara gets out of the water.
Large parts of the actual Antarctica level have to be covered by inflatable boat due to the icy water.