Northwest Dive Club

These guys were all over the place down around the carousel boat and I'm pretty sure we haven't seen them before. And the way it's standing up I wonder if it was spawning?

Greetings,
My guess is that it's a White Lined Ribbon Worm (Tetrastemma nigrifrons) and can be found on page 120 of Andy Lamb's Marine Life of the Pacific Northwest.
You could also try searching on "Tetrastemma nigrifrons" or "Quasitetrastemma nigrifrons" although it seems that there just isn't a lot of information out there!
Searchably yours,
Alex

Hi these have been quite common at Redondo for the last several years. They're often found on wood and there has been a lot more wood in the depths of Redondo the last couple years. The posture of the worm in your photo is unusual though!