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.
First Olsen Tankers
First Olsen Tankers owned the largest ultra large crude carrier ever built, "Knock Nevis", built in 1979 by Sumitomo Heavy Industries that operated as a floating storage and offloading unit until she was scrapped in 2010.