To do it, go through the door shown in the screenshot and you’ll restore the power.

Go back to the main door and you’ll find a stairwell on the left, go upstairs.

Get out of the room and enter the door on the left, then right.

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To get to the tool, use the ventilation shaft on the right because the door is locked.

Take the maintenance jack from the corpse.

Take his keycard and a journal.

Alien: Isolation - Mission 4 - Get through the main door / Sevastopol Spaceflight Terminal - Security

To get out of the room, use the maintenance jack on the door.

Get out of the room and enter the next one.

You’ll find materials and another journal.

Alien: Isolation - Mission 4 - Get through the main door / Sevastopol Spaceflight Terminal - Security

Use the maintenance jack to get there.

Go to the main door.

In the room, you’ll find scraps and materials for crafting.

Alien: Isolation - Mission 4 - Get through the main door / Sevastopol Spaceflight Terminal - Security

After you collect the items, go back to the main door and open it.

They will stay closed until you find the cutter.

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Alien: Isolation - Mission 4 - Get through the main door / Sevastopol Spaceflight Terminal - Security

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Alien: Isolation