Ah, Olongapo, I remember it well. (Ah, Pauline's bar, but that's another story.) At night, USN Shore Patrolmen were spaced at 10-foot intervals flanking the bridge separating Olongapo from Subic Bay. Their job was to keep drunk sailors from falling into the water because the water was so polluted that no one would enter it to save a drowning body.
I was there in 80 and 81, I never saw any Shore Patrol stationed on the bridge.
However, we were told that if we found ourselves in the river, there would be a dozen shots from the local hospital the next day.
I did see a few animals floating down the river, no humans.
The kids used to scuba dive for coins from us, I even have slide pictures from that.
I was in Subic in '77 (LSD-40), '91 (CV-62), '92 (CV-62), and '96 twice (CV-62 was in Manila, I drove down in a rental car). In '91 "Sh*t River" was actually crystal clear for a few days after Mount Pinatubo rained the volcanic ash (lahare) down. It didn't take long for it to get filthy again. In '77 some Marines were busted for throwing coins into the river to intice little kids to swim in and get them, yuck. I always remembered the long lines of locals at the front gate filling up their plastic containers with fresh water. I have no recollection of bloated bodies or impoverished pregnant women hanging around the river. Semper Fidelis!