I don't have a lot of videos of the clams, and need to setup a regime for testing that includes video documentation, but I came across some video I made a few years ago of the first clam while I was testing it's solenoid.

Here are videos of it in air and in water before I attached the solenoid to the top shell:

The first clam used an air core solenoid and was not very powerful, but was powerful enough to open the shell and break the seal (for the clam to descend into the water).