Further than the moon
A "lander" marks the area, where we discuss modern deep sea reseasch, a "black smoker" represents impressively the results of research in an area where men until short could not do any research and the skeleton of a right whale symbolize one of the very few nutrition bases on the floor of the deep seas; an area still further than the moon for us.
The deep sea - an area unaccessible for men for long times due to high pressure. So it was anticipated to be an area unfriendly to life. Results of modern research like the black smoker are showing a different picture: here a wide variaty of animal are livcing, some in large numbers. Additionally a number of processes determing life on the surface are starting here.