The deepest point on the Earth is Mariana Trench in Pacific ocean. It is about 11 Kms or 36,069 Ft deep. The temperature at the bottom is near freezing about 1 to 4 ⁰C . The atmospheric pressure at that depth is thousand times of the atmospheric pressure at sea level.
With such harsh conditions in the deepest ocean, it is no wonder that scientists up till now believed that no life existed there. But now, they have proved themselves wrong.
A Danish-led team of scientists, using a robot to take samples, found presence of large amount of bacteria and other microbes. These microbes feed get their nutrition from Dead plants and fish falling down to the bottom.