So my wife and I were playing some multiplayer, I setup the first shuttle with oxygenator and headed off to a new planet. I tethered my way down into a cave and went afk still tethered and completely safe. A couple minute later my wife who is back on the home planet says "Oh nice! an oxygenator just sitting here on the hill by the base." I get back to my pc to find myself back in the shuttle after a respawn. I get out of the shuttle to find my oxygenator is missing! Tethers are all dead. This was rather funny and i managed to get a new one built from scratch, but it is quite the pain!