This video was recorded on 1 January 2016. On the Afsluitdijk, the causeway separating the salt/brackish water of the Wadden Sea from the fresh water of the IJsselmeer lake in the Netherlands.
That dikes causes problems for fish migration.
The New Year’s Day swim in cold water was to get publicity for the plans to reconstruct the Afsluitdijk, making fish migration easier.
Pingback: New tunnel for saving 350,000,000 migratory fish | Dear Kitty. Some blog