This limitation of how deep we can go before being forced to come back up means there's still a large portion of Earth's deep blue that has gone undiscovered - approximately 80%, in fact - which, to me, adds to the fascination of what's beneath sea level. Also due to the heavy amount of water pressure the deeper one goes underwater, this can affect not only the human body, effectively crushing their bones after a point, but can ruin machinery as well. Because of such a heavy focus on what's happening on the surface, underwater species continued to form and create a history of unknown life - much of which we still don't know about and continue to discover to this very day. As land began to form, so did the cells that comprised so much flora and fauna and saw life slowly but surely make its way onto land, and as the years and eras went on the life on land became just as important as that beneath it, but the focus and interest of life itself leaned heavily towards life on land and its various biomes as homo sapiens built civilizations alongside their need for oxygen (and obvious lack of gills). The beauty of our little blue dot in our solar system, known as Earth, is that it's carried with it billions of years of history that has been responsible for a vast number of organisms both macro and micro that have simultaneously reached a point of history where they became extinct and evolved into the very life we know today.
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