I have encountered a base on Server name: DayZ NL 3664698 (Public) - Hosted by Multiplay.com
Address: 64.95.100.140:2402

where a group has used military and car tents to create unraidable bases. The same group seem to also be using a duplication glitch as well but that will be for another post. The group seem to of deployed 2 tents facing each other so you cant you cant get in from the outside and then using some sort of car glitch to get out from the inside. as there is no way to destroy tents you cannot get into them especially after them raiding you to get your stuff back