Flooded Archives - South Side of the Pool with the Giant Statue (Part 1)

Enter the building through the well-lit archway south of the Greek Fire Depot Base Camp.

As you follow the flooded passageway, you'll hear voices...

...then glimpse 3 Trinity soldiers ahead. Swim under the wooden beams and stay submerged as you approach the first soldier standing on the ledge above.

When you see the Melee icon above his head, press Y/F to drag him into the water and drown him.

Climb out of the water...

...and take out the 2 remaining soldiers.

Loot the bodies and grab some arrows and other ammo. Then climb the ladder on the north wall.

Use a rope arrow to pull down the wooden barrier on the right.

Go through and pick up a stack of gold coins lying on the floor in front of the gilded horse statue.

Follow the hallway behind the gilded horse statue...

...to a dark room with workbenches and antique scientific apparatus.

In the back left corner there's an Archivist Map (1/1) spread out on a table. Examine it to add the locations of any unfound documents and relics to your map.