This should prove useful for anyone designing an underwater robot and want to see an example.
After separating it in half by removing a dozen screws, you'll see they beige looking box. This box houses most of the electronics and mechanics.
You'll see what looks like a servo horn at the top with two thin wires. This is the motor responsible for flapping the caudal (tail) fin.
This heavy metal weight at the very bottom helps the shark toy balance right-side-up
It also had two plates of styrofoam to help keep it balanced and neutrally bouyant.
On the left is the on/off switch, and on the right is where the battery plugs in.
All the circuitry was housed in that beige container. If you look closely, you'll see a black rubber band around the rim that was used as part of the waterproofing. The other half would press firmly against it.
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