What are these?? WA state near Oyster bay

For context, I work farming shellfish in WA state and today we were at Oyster bay. We were harvesting floating bags filled with clams(the bags are usually just filled with oysters and I haven’t seen the worms near the oysters before). Looks like a worm of some kind. We netted one to get a closer look. My coworker dropped it and it looked like green goo came out of it (assuming it’s either the blood or innards of the creature). My coworkers and I are super intrigued and I couldn’t find the right key words to find anything similar online. Thank you:)