Sagan
Gi 310 was a light anti aircraft battery. It had two bunkers type L 409A for 2cm guns. There is a 502 and a bunker that is on the map noted as a 1b/563. This one is designated as being a waterbunker. Since all bunkers are firmly dug under, we could not find out anything the noted waterbunker.
Obvious a 502.
The 563 waterbunker, must be. Note the closed opening on the roof.
A first L 409A.
The second one lost its upper part.