This was an expedition escalation received from Heirarchy.
Summary:
No acceleration gate. Warp to location bring you right to room with enemies. I was able to warp in cloaked and get to position.
Then
Then after killing some stuff
Killing the Sentient battleship triggered the next step in the expedition.
I warped in cloaked, and the beacon was just far enough away that I stayed cloaked. I didn't see any enemies so I decloaked and tried to burn to distance with MWD. I almost lost the ship. Had to overheat repairers as I got to distance. Should have stayed cloaked and gotten range. These drones hit hard and far.
Killing the Sentient lead to the next escalation.
5 mil in drone parts from Sentient.
Warped in 2,200m from the beacon, barely kept my cloak.
On warpin:
On decloak, Sansha ships showed up.
Then more elite drones spawn
Kill the Sentient and loot.
Got 18 mil in drone parts from Sentient.
On warpin, beacon decloaked me, whole group aggroed. I was able to burn out to range.
There is no Sentient ship initially, but a ton of drones.
Eventually, the Heirarchy Hive Mother spawned, 15 mil bounty and dropped 105 million in T2 salvage.