They don't mention being on a ferry between Germany and Sweden, but there must be one. Otherwise you'd be told to swim again, or they'd route ya through Russia and Finland to keep ya on land.
Following the suggested route, there must be a ferry link between Germany and Denmark. That too could be avoided by taking a slightly longer route. But once in Denmark, the route goes on land, crossing the 8km Íresund Bridge from Denmark to Sweden.
__________________ To err is human. To moo is bovine.
Who is this General Failure anyway, and why is he reading my drive?