Oct 18, 2016
Brinicle
These icy underwater tentacles are often referred to as “sea stalactites” because of their bizarre appearance, but their deadly nature has earned them another nickname: “icicles of death.” When this sea stalactite reaches the seabed, a web of ice forms and spreads across it, freezing everything it touches — including any sea life it encounters, such as starfish and sea urchins — which is how brinicles (brine icicle) earned themselves a reputation as "icicles of death."
Laura Moss - http://www.mnn.com.