Vault of the Aten (Aten)
A treasure location and relic statue hiding place in easterly Aten.
Both seekables are in the large building, but the entrance is underwater. Have Senu scan the east end of the Vault to tag it.
Swim in and up for access to the Vault proper. Loot the small carbon crystal box to complete the location.
Don't forget to smash the relic before leaving.