I'm afraid I don't understand what you mean by the "Deep sea". Do you mean how much of the earth's surface does the deepest section of the sea cover? I know that oceans and seas cover 75% of the Earth's surface, approximately.
Although we don't know the exact answer to the question, we think that about 70-75% of water makes up the Earths crust.
Indian Ocean covers 20% of water on the earths surface.
About 30% percent of the Earth is covered by the Pacific Ocean.
it covers up about 68.47 million % of the earths surface
Ocean
Ocean.---WEG
i believe roughly 70% (not completely sure though) I'm not really sure, but something like 70% of the earths surface..
The ocean is considered an ecosystem. 70 percent of the earth is made up of ocean water.A+-- Marine
About 71.1% of earths surface is covered by the ocean.
It is the Atlantic Ocean
Pacific Ocean
the ocean
The second largest ocean is the Atlantic ocean. It covers an estimated 20 percent of the Earths surface with 106,400,000 sq km total area.