This isn't the pacific, but this is pretty cool:
http://www.cnn.com/2004/TECH/science...eut/index.html
	Quote:
	
	
		| ... The international scheme will include probing a 12,470-ft abyss off Canada described by project leaders as the "world's oldest sea water -- a vast, still pool unstirred for millennia, walled by steep ridges and lidded with ice."
 ...
 Ron O'Dor, chief scientist of the 53-nation CoML, speculated that Arctic waters might hide creatures known only from fossils, such as trilobites that flourished 300 million years ago. The trilobites looked like over-sized modern woodlice.
 ...
 | 
	
 Man I would so want to have a pet trilobite... 
I tried looking up sites that might have information about abnormal sonar/radar readings in the deep Pacific, but all I could find we're sites about Atlantis. Anyone else come up with anything?