Heavy tank
The Char 2C was one of the largest tanks ever produced. At the start of World War II, France and the Soviet Union were the only countries to have inventories of heavy tanks, such as the Char B1, T-35, and KV-1. The Matilda II was designed under the British infantry tank concept which is similar to the heavy tank having thick armor and weighing more than their other tanks. It’s usually separate because they have less firepower with their cruiser tanks (comparable to mediums) at the time having the same main armament but more machine guns. Later war examples were the German Tiger I and II, as well as the Soviet IS series. Note that "heavy" versus "medium" is more a question of tactical roles than weight; the Panther, for example, was a "medium" tank that outweighed most Allied "heavy" tanks.
Pierre Guillaumat (supertanker)
Pierre Guillaumat was a supertanker, built in 1977 by Chantiers de l'Atlantique at Saint-Nazaire for Compagnie Nationale de Navigation. "Pierre Guillaumat", which was the third vessel of Batillus class supertankers (the other three, slightly smaller, were "Batillus, Bellamya" and "Prairial"), is distinguished as the biggest ship ever constructed (by gross tonnage, a value based roughly on internal volume, not mass). It was surpassed in length, deadweight tonnage(≈cargo mass), and displacement, only by "Seawise Giant" (later "Jahre Viking, Happy Giant" and "Knock Nevis"), which, though it was originally smaller when it was built in 1976, was subsequently lengthened and enlarged.