You asked about the $150 camera.

Here it is:

Nikonos V (I bought mine on eBay)

Photos I've taken with the Nikonos V:

But here's the thing, you don't even need $150 to start.

You can start with a $9 camera (just search for "waterproof film camera on aliexpress):

Some of my favorite shots were taken with this camera:

Now that you have your camera sorted, what's next?

Because having the gear isn't the same as knowing what to do with it.

Want to learn how to stay safe in the ocean?

And how to position yourself in the lineup? 

This should be really helpful