If you're being dropped off at CCV Wall, you keep the wall to your left as you swim in, until you reach the sandy channel, and then follow the chain (and generally a stream of other divers) on in. If you're being dropped off at Newman's Wall, you keep the wall to your right as you swim in, until you reach the same sandy channel, and then follow the same chain on in. It seemed there was always a flurry of divers hanging around the channel or the wreck that's there, coming in or heading out, and there was really no way to miss it.