AG leak; help!!

[matt4x4]

Many times, holes get into the liner because someone was not careful with removing the steps in the fall - look there FIRST since it sounds like the hole was caused when the pool was closed and not discovered until after closing.
Get the water left in the pool clean by adding some bleach and stirring it around with a broom, the algae should fall out within a couple of days giving you relatively clear water to look around in.
Check at or just above the current water line first (you may have had some evaporation allready) - especially if it's not dropping any more.
You can also add a few inches of water to the pool, this should start the leak going again, so you can look for teh wet spot and narrow down the location.