Feeling the Thrill of Wheeee!

A close-up view from inside a boat or ship, showing a circular porthole looking out onto choppy, greenish-blue water with whitecaps. Below the porthole, a white, pointed metal object, likely a hull-mounted device or part of the boat's structure, extends downward. A small yellow patch is visible in the bottom right corner. The text 'swl 30' is handwritten in white above the porthole.