There are many things that are hidden in the sea

Do we know that man has gone down to about 12 km deep in the ocean. In the depth of 12 km, he has seen many creatures, many plants and many things. In the darkness of the sea, he has explored a lot. There are thousands and millions of creatures in the sea and some are written and some are fine, thus the water at the bottom of the sea cannot reach the light of the water, there are many hidden things that man is gaining knowledge of.