Mammoth Lake Scuba in Lake Jackson is a pretty nice site inland. They have a c-130, fighter jets, fire trucks, and many many more things. It is an old archeological dive site where they found what else but a mammoth. after words they filled with a ton of obstacles and things to see. Visibility is generally around 20 feet which is ok for what you’ll see. Great restaurant next door and fully stocked dive shop including nitrox. I definitely recommend it if your going to dive inland don’t miss this place.