karst spring

I'm living and working on Platte lake for 1-2 months. Are there any divers in the northeast Michigan/Traverse City area that would be interested in partnering for some dives? I'm not familiar with the area and will graciously accept any dive along if I'm free. There are also some possible...

Arsenovsky spring. On the territory of the Orda village in the Perm Krai there is an unremarkable pond. From above it may seem overgrown and lifeless, but its unimaginable landscape is hidden under the water. Just 700 meters from the spring there is the longest underwater cave in Russia -...