Is the pool holding water, or draining?
Take several pictures of your pool pad, to capture the positions of all the valves.
Dig. You have to dig up the pipe and get good clearance around it, to both see what is going on, and to later fix it. I've used a shop vac (rated to vacuum water) to clear a mud hole like that of water. Or siphon water out (if you can run a hose to a lower spot). Or scoop it out with a cup.
After the leak is exposed, do what you have to do to stop the water from running out of the leak. The pump should still be off. Turn off the breakers so no timers or automation turns the pump back on in some number of hours. Start turning valves and or plugging returns, skimmer ports, drains, etc and try to stop the water flow.
Take a picture of the leaking pipe and return here for advice, or take the picture to Lowes'/HD's plumbing department and get help on how to fix the pipe. They'll need to know the type and diameter of the pipe.
Or you could call a plumbing or pool contractor and have them fix the leak, but you could be looking at a few days or more before they could respond. You could have it fixed by then...
After you have it fixed, reverse what you did to stop the water flow. Remove any plugs. Restore valves to their previous position (refer to your pictures). Double-check everything is as it was, then start your pump...
You can discourage animals from "rooting" by laying down hardware cloth (chicken wire). Use irrigation staples to hold it in place.