Here is some footage from 250’ beneath Puget Sound near a river outflow. We found abundant eelpouts, shrimp, and a few sea pens and sole. The Trident is dropping down attached to a downrigger ball to get to depth easily. Then the pressure sensitive downrigger clip is shaken loose to go exploring: https://youtu.be/pnk9USiA5BQ
That’s a very healthy river with lots of residents at the deep.