What was the biggest merchant ship ever created that dwarfed existing ones and still is considered a behemoth today?To clarify,It can be a Merchant vessel or a naval warship.(Also can be a list too)
The biggest ships ever created are the oil super tankers. There is a famous book published in 1978 called "Supertankers!" which is all about these ships and is very interesting. The biggest ship ever was the supertanker Seawise Giant.
Progress in ship size has generally been pretty gradual, so there have not been many big leaps. One notable ship from the past was the Oceanic which was the largest ship in the world from 1899 to 1901.