Actually Keefy this was an innovation in shipping design and cost saving. They couldn't afford a glass bottom for observation so the designed it to sail on its starboard side and view through those portholes. However the downside was that they could only utilise the starboard propellor. They also had other logistics problems such as keeping the crockery and cutlery on the table and the beer in the glasses. In the end Lloyds of London wouldn't insure the vessel and it was sold to the Tierra Del Fuego Shipping Line as a floating wharf.
Bob