The ship was scuttled prior to Japanese occcupation to deny it to the enemy. As far as I know, no one was killed during the scuttle and I'd assume that it was pretty well stripped (except for the 8in guns). I don't think that the WWI technology is an issue, although if the aliens arrived BEFORE Roswell...
Seriously, no bodies, munitions, or technology that I know of. There are other USN wrecks in Subic that they don't seem to mind people diving, but those are all smaller. There are some old IJN wrecks (probable war graves) big enough to get you into trouble, but as far as I know USN doesn't mind you diving those.
<---That's me at the helm of a Japanese Patrol Boat (no known casualties). I seem to have taken a wrong turn