Beginning of the Isolated Station Event for TOS characters and starships. Duration: 2 weeks for Easy and Normal versions; with staggered-start 1 week for Legendary version.
Levels of the Event are timed to open throughout the first week, revealing the storyline about some treachery within Starfleet. By the end of week one, all levels are open for Easy and Normal versions. Also, at the end of week one, the Legendary version becomes available (all levels, open immediately).