I know of two swimming spots..
One was the Trona swimming pool located a mile east of Trona. The other was the old,cement water-holding pool that supplied water to the chemical plant west of Trona. I'm excavating Boroslavy Canyon which is the next canyon west of the cement holding-pool. I will post photos of the marbles and other artifacts I've excavated. For the moment I'm weathering a big storm hitting Trona. Gale force winds and rain. Even the birds are flying backwards. As regards marbles,etc that aren't worth much,they have a value far beyond the monetary. It's that aspect of 'treasure hunting' that should be receiving greater attention. I've met so many folks who think hunting for artifacts is like buying lottery tickets. I've taken people to my excavations,showed them the ropes. Ten minutes later they give up and say "You did'nt tell me this would be work". I'm always polite but soon as I'm out of sight I slap my knees and howl with laughter.