Vault Breaker, Bungie‘s new experimental PvE game mode for Marathon, will stay online according the extraction shooter’s development team. Because of that, Vault Breaker will remain live until August 18. The experimental mode allows Runners to delve into the maze-like Cryo Archive, a map previously reserved for Marathon’s highest threat, endgame PvP skirmishes. We came away from the PvE mode feeling a little disappointed. With that said, Vault Breaker is clearly labelled as an experiment.