There is one main entrance. You can follow the road out the other side, but it is a very steep rough road. Unless you have a 4wheel drive vehicle with high clearance, you run the risk of getting stuck
Use the access from Shenks Ferry road from the north, NOT Green Hills Road which is very rough, unmaintained and only accessible if you have a high-clearance 4wd vehicle.
You should definitely go out the way you came in.
Thanks! Your answer is awaiting moderation.