Are you going all nads on us?? 
Could be Free, I do wonder about the dead spots in our seas and oceans. Are they man made or just natural occurrences of nature or a combo of both.
My most favorite news clip was when some Admiral trying to keep a straight face was questioned by a law maker that feared Guam would tip over.-- The self control of the Admiral was spectacular.
Far as I know no submariner wants to topside ride until they get to port. Bouncing about in that tin can on the surface can make the Captain of the Pinafore very sick at sea.
The Japanese fisherman lately report the giant squid they catch being caught in waters they should not be in. They the squid live at depths unimaginable to us and something is driving them up from the depths. Is it possible that the submarines can now reach depths we never imagined before and running them out of their habitat ?
These questions are one of the reasons I am not too excited on exploring Mars. We have no idea what is on our own planet and need to find out before we try to understand other planets. A kind of Know Thy Self before trying to understand strangers.