The Meander
When the river which runs South across The Plains from the Falls of Ardun is running low, it uncovers a meander which is close to forming an Oxbow lake. In here, there appears to be a large Builder artifact; roughly rectangular metal object approximately the size of a hut or small cottage. Brys swam down to it and discovered some sort of hatch.
The size and shape of it was reminiscent of the flying objects we saw in a builder recording of Ikadeshdeshdeshdeshur
It might be excavatable with the right tools and many strapping men