During World War II, when the icebreaker Tarmo was hit by a bomb, the navigating deck and most of the cabins were destroyed, but the hull did not even spring a leak.
Pada Perang Dunia II, sewaktu kapal pemecah es Tarmo dihantam bom, geladak navigasi dan sebagian besar kabin hancur, tetapi badan kapal tidak bocor sedikit pun.