I got here first.
The Halibut Bomb.
I took a 6" piece of galvinized pipe, drilled holes in the side.
Took two end caps and drilled holes in the center.
After screwing on the end caps, I ran a length of steel leader through the cap, tunnel, and cap.
I crimped a hook to one end, and a loop to the other. Leaving enough slack so that I could unscrew one end to load it with bait.
I never got to use it... my friend sold his boat and that was the last place I saw it. But, I bet it works!