I'm watching it now, interesting stuff. Not sure what to make of it, seems like such a critter would have been found by now.
Seems like the piece is more about the new Navy sonar.
At times it feels like some sort of Blair Witch Project spoof.
**EDIT**
I did a search for the 'spears found in ocean fish' claim and found this site:
http://nz.answers.yahoo.com/question/index?qid=20120528065900AAkdtLZ
Turns out they admit that it's fiction in the closing credits. It's at the end of the credits, you have to pause to read it. Some of it is interesting, one wonders if maybe the apes that became humans did spend some time more in the water, might explain the hairless thing.
I did a search on the 'baby swimming instinctively' point and found this site, debunks that notion pretty well:
http://www.aquaticape.org/swimbaby.html