What is the danger of an iceberg?

Iceberg, translated from the German language “ice mountain” for all their beauty and grandeur, they are not a small danger to mankind. Glaciers have a large area, what we see on the surface is only 10% of their area, most of them, about 90% under water, in the depths of the ocean. They pose two dangers to humanity: 1. Flooding of land if icebergs start to melt. 2. Sinking of ships, ships. Sailors can only notice them during the day, and at night they are very dangerous, many ships have sunk exactly icebergs, as an example of the legendary Titanic.