Hi, I'm Mark from the picturesque city of Leicester in the East Midlands. I had a very odd experience earlier today and because of it I've decided to trawl the great www to try and find out what happened.

Just recently, I've started going swimming pretty regularly at one of my local pools. The one I go to most has a wave machine in it, which until now I've quite enjoyed. Usually I'll have a pair of goggles on and if you go under the water, you cant see about two meters in front of you because the water is so cloudy (mucky), but they must have just cleaned it out as today the water was crystal clear. My boyfriend, who i normally go with, had some weights which he was throwing in and I was getting them from the bottom of the pool, until i got to the deeper end and saw a black grate, from which the waves are produced by the wave machine. I don't think I've ever felt so terrified in my life and I just had to get out of the pool. Just thinking about it now is making me shiver and feel sick, but the more I think about it, the more irrational it seems.

I was hoping maybe you lovely people may be able to help me get my head round what happened today...

Thanks
Mark.