Just checking if anyone has seen cracks of this nature on a gunite pool & could give any insights as to why this is happening and what to do. Builder has delayed responding to problem endlessly, and recently with various versions of “not my problem.” Extremely frustrated. Also have similar cracks forming below sunshelf and adjacent steps. Could pool water be getting in behind plaster from grout between rocks? This is where the crack began on the sunshelf. We did have water discovered under the pool during construction but installed a pump casing with pump during construction (for making sure water is evacuated below pool in case of repairs). Builder did not indicate this was any problem when building pool. Water surface in pump well consistently measures below depth of pool. We have shut off auto-fill to see if water is indeed seeping in from “pressurized ground water” (as builder put it). He predicted water level would stay the same if water is seeping in. Water level has gone down 1+” in 4 days. Any insights would be much appreciated.