In the last thread someone pointed out that the football game on the night of the murders was against UC Davis, so maybe someone from CA was there from out of town. It's against all odds, but for what it's worth a quick search of the UC Davis Marine Science Diving Safety class itemizes the required equipment with things like:
Booties
Gloves
Wet suit
Hood or hooded vest
Dive knife
I've seen more than a few speculate here on WS that the perp may have been wearing something akin to a wet suit, and I know I saw at least one comment that scuba divers use knives related to the knife profile we've read about associated with this crime. Here's what a dive knife looks like:
And here's the link to the UC Davis list of required items for the scuba class:
Scuba Equipment Estimated Expenses Required gear
marinescience.ucdavis.edu
Highly doubt any of this is relevant info, but what is relevant can only be determined by first considering it.