Besides the super glue to keep the donut mask and the single swim fin on?
I don’t know, I am new at this. Maybe a redone thimble?

This sounds like a Wally question.
I would think that weight would be required to hold the worm down in the water, Glue him to the magnifying glass so he can see under water, and depth gage so he can see how deep he is at, so that he doesn’t get the bends when he comes back up. Nothing like a worm with the bends.