The Nazis dumped lots of ammunition in various different lakes and harbours near the big cities after WW2.
There was also an ammunitions factory near this lake which used to dump various ammunitions and other waste in the lake if i recall correctly from the Norwegian article on this.
KulFlux3 t1_ixnfnoa wrote
Reply to comment by Octavian1453 in Medieval shipwreck discovered in Norway during hunt for WWII ammunitions - could be one of Norway's oldest shipwrecks has been found on the bottom of a lake near Oslo. by ArtOak
The Nazis dumped lots of ammunition in various different lakes and harbours near the big cities after WW2. There was also an ammunitions factory near this lake which used to dump various ammunitions and other waste in the lake if i recall correctly from the Norwegian article on this.