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.
Merchant ship
Among oil tankers, supertankers were designed for carrying oil around the Horn of Africa from the Middle East; the FSO "Knock Nevis" being the largest vessel in the world, a ULCC supertanker formerly known as "Jahre Viking" (Seawise Giant). It has a deadweight of 565 thousand metric tons and length of about 458 meters. The use of such large ships is in fact very unprofitable, due to the inability to operate them at full cargo capacity; hence, the production of supertankers has currently ceased. Today's largest oil tankers in comparison by gross tonnage are "TI Europe", "TI Asia", "TI Oceania", which are the largest sailing vessels today. But even with their deadweight of 441,585 metric tons, sailing as VLCC most of the time, they do not use more than 70% of their total capacity.