You can easily glitch through any wall, fence or surface by dropping an item on the ground with your back against the wall, walk backwards while looking at the item and try to pick up the item but before you pick it up you aim. Repeat this motion until your character is forced to the ground then you can crawl backwards through the wall or you may be dropped to the bottom of the map into water then all you have to do is swim under your desired location or a base then logout and back in