Step one - waterproof the room. French drain on the perimeter, and fill any cracks. We've done this in other sections of the basement after we've had problems. This time we did it before we had a problem - but with four cracks, it probably would not have been a dry place much longer!
Hobbiest photographer with occasional delusions of grandeur, and several cats. Several years here on 365 project, after a few years on Shuttercal before that. You...