The sea is made of water therefore all water in it is below sea level.
Ground level is the surface of the dry ground.
Your question therfore makes no sense.
water table
A region that lies below the level of the surrounding land is called a depression or basin. This area typically collects water and can be characterized by lower elevation compared to its surroundings.
I know that the dead sea is below sea level
Ground watera suppply of water that lies benth the suface is
The footing lies on the ground around the base of the structure. The Foundation cn go way below with pilings deep into the ground.I can say that the footing is the part of foundation which transfers the load directly to the soil and foundationis the part of structure below the plinth level including the footing while footing is the part which is below the ground level.
Around one quarter of the Netherlands lies below sea level, and approximately half of the country's land is less than one meter above sea level. The nation has an extensive system of dikes, pumps, and barriers to manage water levels and prevent flooding.
The wreck of Titanic lies about 12,600 feet below sea level.
Death Valley
All of the Netherlands lies below sea-level
death valley
Closest to the surface of the earth at Sea level or any portion of land that lies below Sea level.
about 90%.