I was watching the antics of little fish in the canal behind my house and saw a snake swimming underwater. It was 18 inches long, pale yellow, almost white, with brownish stripes down its back. It saw me and took off underwater and I never saw it pop up again.
I know we have banded water snakes here, and I've seen several snakes swimming on the surface of the water, but not underwater for an extended period. Still trying to figure out what it was. I don't think it will last long with the alligators cruising along the canal all day.