Panzer VIII Maus
Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944. It is the heaviest fully enclosed armoured fighting vehicle ever built. Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by advancing Soviet military forces.
History of the oil tanker
The 475 ft., 7-masted schooner "Thomas W. Lawson", built in 1902, was the largest purely sail tanker ever built. It carried coal, and oil in barrels from Texas to the East Coast of the U.S. This schooner was fitted out as an oil tanker in 1906, and sunk in a storm off Isles of Scilly in Dec. 1907.