I'm hearing a back and forth between two males in a Scandinavian language, more likely to be Norwegian or Swedish than Finnish or Danish. This was heard on several German SDRs. Conversation completed by 1835 UTC.
There is data QRM in the background and at first I confused that as sounding like boat engine noise during a long transmission being made by one of the operators. However, after I started hearing back and forth between two operators and the the noise not changing during the back and forth, I realized that it was unrelated to the conversation.