49 years ago today, May 30, 1976, KISS were on the Scania Ferry traveling from Denmark to Sweden. They would play a show in Lund, Sweden, later that night. In the upper left of the photo below is Gene Simmons, Rick Stuart (security), and Paul Stanley. In the lower right is Lydia Criss, unknown, and Peter Criss. The photographer responsible for this shot might be Ace Frehley but that's not confirmed.
Info/photo courtesy God of Thunder / Magic - Kiss Chronicles 1973 to 1983.