Hi everyone, I have noticed the last 3-4 yrs a hairline crack in our plaster/gunite pool. It is very tight, cant hardly get a fingernail to stop in it but its there none the less. Today, with goggles, I looked over most of my pool and saw another hairline crack on the far end. Both cracks seem to start at the top of the plaster, right under the tile work, and they both extend down in the water maybe 3-4 feet. Should I be concerned or is this a normal occurance. My pool is about 7 yrs old and I do think at least one of the small cracks has been there for 3-4 yrs at least. At this point I am pretty sure no water can escape but should I think about doing something now or just wait and see what happens over the next few years ?? Thanks for you input.