While it is possible to fix a crack in your swimming pool yourself, it is not recommended. Some jobs call fo the work of a professional and this is one of them.
THE swimming pool under the NIGHTCLUB.
Yes, plaster will dry out and crack.
It would cause excessive mud and the swimming pool would sink slightly. It would only cause a sinkhole if there was a hole underground under the pool.
It is possible. The places where that could occur would be in an outdoor pool that has exposed metal or in an indoor pool with a glass door, window or ceiling.
State and local codes dictate location of pool lighting.
Hmm, that's a good one. Did you witness this? Most likely the crack was or is caused by earth movement like an earthquake. Re reading this question -- you must mean lightning not lighting.
A crack in your swimming pool indicates a structural defect. Contact the pool manufacturer - your pool may still be under warranty, meaning you could get it repaired or replaced for free. If the pool is not under warranty, contact a pool repair specialist; you may want to get estimates from three or four people before you hire someone to make repairs.
cause your an idiot