So . . . Frank perfected his miinuaturization machine, and they're stuck in a dry children's aquarium?

Yes, the Pearl is a submarine, and declared to be the finest thing ever made, ingenioous in conception, masterful in execution, lavishly appointed, and so on.

Here's the end. They usually concluded with such shenanigans, and gave the young reader some insight into the nerves of other races.

Didn't know that about the shins, did you. Well, all boys know that.