On the wall of one of the buildings.
By the wall, out in the yard, by the fire, in the Citadel Plaza Base Camp.
Right after you enter the crypt (it is under the water surface, you need to dive under the building).
Crypt treasure 1 (Element of an ancient bow)
After you enter the crypt (t is under the water surface, you need to dive under the building) smash the wall. The path leads you down. In the flooded chamber, swim over into a small chamber on the left.
Coin Chest 1
Near the monolith, by the heap of stones in front of one of the buildings.
Coin Chest 2
On the ground, by the stone base.
Coin Chest 3
In the very corner of the destroyed buildings, by the window.