It's a mud-pit that will leave your gear a stinking mess. But it's our home mud-pit and we love it anyway. See you there this Spring/Summer/Fall.
Millbrook is perfectly safe, but it's also fickle depending on where in the "Lake" you're located. As you swim toward the gate there is a submerged boat wreck on the bottom which is almost always completely silted out. We were doing a dive on the boat one day last Summer, with a combined rain and localized construction on that side of the lake it was totally silted out. We should have called the dive off, at five feet, but we kept going down to 12 feet, we all lost our buddies, no one could see their gauges, or computers and fortunately the one minute separate rule was applied and everyone surfaced accordingly.
Platform 3 has been raised, so now you have three training platforms - two of which are at approximately 27 feet, the third at 12 feet. The 12 foot platform has a guideline down to the airplane which rests generally at about 65 to 72 feet depending on who's measuring. Either way it gets you below 60 feet for things like AOW Deep Specialty, etc.
The center of the lake is featureless, but it dives sharply down to about 88 feet. There are a number of interesting features in the lake, but it's generally looked down upon with Lake Rawlings only 2.5 hours away.