This strongpoint is called Gi 329 (Bromberg). It provided the last stocks for the U-boats before they went to sea. Therefore it has a pier, some fueltanks and watersupply bunkers. AA-sites and some former barracks complete the site. Nearby, next to the present watertower, lies an other water bunker, type Sk Tiefbrunnenstand.
Somewhat more inland a 502 lies in Stp Gi 328 (Heilsberg).
Partly burried remains a second watersupply bunker, this one is type 1b/564-1.
(J.F. Laquièze thank you for the information)