Earlier quoted context omitted.
I think part of that is that due to the immense pressures and other factors it's almost easier to explore the galaxy.
I'm well aware but it seems we're more willing to find a way into space than into the ocean depths. If we found it more important, we would've developed a better way to explore the deep blue. I think we've come to understand that whatever we perceive to be greater than us from what exists beyond the clouds.
In another comment on this thread, in another context, I mentioned the architect, Eugene Tsui. He designed a house based on the tardigrade, which is apparently "the world's most durable organism". This relates to your comment because one way to study the oceans is to use examples from other species, such as the tardigrade, a tiny animal which "can withstand pressure of 6,000 atmospheres, which is nearly six times the pressure of water in the deepest ocean trench." We should be able to figure out how they can do this, and then apply the knowledge to our explorations.
http://en.wikipedia.org/wiki/Tardigrade http://en.wikipedia.org/wiki/Eugene_Tsui