Is there land underwater?

Other notable submerged landmasses include Beringia, Doggerland, the Kerguelen Plateau, Mauritia, Sahul, and Sunda. Submerged continents have been sought and speculated about in regard to a possible “lost continent” underwater in the Atlantic Ocean.

What is the biggest continent submerged?

Still it is Zealandia. The continent is 1.9 million square miles and is about half the size of Australia.