The document discusses icebergs, dangers at sea like storms and whirlpools, and the sinking of the Titanic. It describes icebergs, noting most are located near Antarctica and Greenland. While they can impact ecosystems, they also provide habitat. It then discusses whirlpools and storms as dangers before detailing the Titanic, the largest ship at the time, which struck an iceberg and sank in 1912, resulting in over 1,500 deaths.