This is the campaign's biggest level, so it pays to settle in and take it in stages. Bond arrives by yacht with Isola at Sir Nicholas Webb's remote Antarctic research base, the cover that hides his real work. From the gate house you push deeper through the staff departments, talk your way (or sneak your way) up the security tiers, and finally drop into the silo where HYPERION is kept. Expect long stealth stretches broken up by scripted shootouts and a couple of android fights as the finale ramps up.
After the opening on the yacht, follow Isola up to the cliff edge and give her a boost so she can climb to the top. She splits off and asks you to meet her at the gate house. Move through the entrance area quietly — the Hide and Seek challenge wants you across the gate house without being spotted, so take the patrol on your side while Isola deals with hers, and stick to cover.
Inside the gate house, grab the Ace of Bells card from the couch up the stairs near the cable car, and the Snow Globe memento sitting on the central reception desk. Out on the approach, the Under of Roses card is at the end of the hallway before the yellow scaffolding (the gantries).
Pick up both staff IDs here, then head back down to rejoin Isola. Board the cable car in front of you to cross to the main facility.
On the far side, make for the Robotics Department. The elevator down is listed as out of service — shoot the control panel on the wall to short it out and force the doors, then ride it down. Clear the floor however you prefer; this area has several opportunities tied to challenges, including powering up a shooting range and using phone darts to mess with the robots' behaviour.
Two collectibles live here: the Jaws Design Specs legacy item on a toppled server in the left/corner crate, and the 9 of Bells card on a box (with a half-built card house) just right of the Utility door.
Continue into the Operations Department. Push through the gantries and utility floor; if you're going for the clean-hands challenges, you can clear these stretches without firing a shot by using the Q-Lens to spot ledges and take guards down from above. Once you've dealt with the area, use the ID upgrade machine to bump your wristband up to clearance level 5, which opens the higher-security doors ahead.
Grab the Webb's Manuscript intel on the chair sitting on the rock by the cat statue, and the M Profile intel from the desk in the Security Office (reached through the Archive — see below).
To slip into the Security Office you go in through the Archive and its vents. Lift the Office Key off a nearby civilian (a poison dart and a pickpocket does it cleanly), use it to open the locker room, and read the note inside for the keypad clue. The answer is 1864 — punch it into the Archive door, then follow the vent run into the Security Office for the M Profile.
The note is a small math puzzle; if you don't want to work it out, the code is just 1864.
With clearance sorted, head for the Command Center, where Isola is waiting at the gate. Things turn loud from here — expect a sustained firefight (good place to knock out the headshot, silenced-kill and "five different weapons" challenges) and a freight-lift sequence on the way down.
After the lift bottoms out, move ahead to the control panel for the HYPERION door. You need the Override Key, which is sitting in the lift — but reaching for it triggers an android that Webb's people switch on. Use the environment (a server can be dropped on it to finish it) to put the machine down, then return to the panel and use the key to open the door.
On the way through the silo, pick up the Antarctica Postcard from the trolley by the window just after you get the Override Key, and the Robot Keychain memento on the podium after you drop out of the vent at the bottom.
A cutscene takes over inside the HYPERION chamber. Webb appears and gets the drop on Bond, but Isola steps in and shoots him; Bond tries to stop the leak while Isola pulls the HYPERION core and runs. The chapter closes on the extraction at the sub, where Bond shoots the core out of her hand and destroys it before reporting in to MI6.
Nine collectibles (verified names and spots):
Nothing here is missable — you can mop up anything you skip later with Chapter Select.