self.pclass = None # could be ""M", "N", "O", or "destroyed"
self.crystals = "absent"# could be "mined", "present", "absent"
self.known = "unknown" # could be "unknown", "known", "shuttle_down"
self.pclass = None # could be ""M", "N", "O", or "destroyed"
self.crystals = "absent"# could be "mined", "present", "absent"
self.known = "unknown" # could be "unknown", "known", "shuttle_down"