The Deck 7 oceanview secret nobody advertises

Navigation officer, MSC Seashore. Deck 7 oceanview cabins on the Seaside-class ships (Seashore, Seaside, Seaview) have a unique advantage that is not in any brochure. Due to the ship's hull design, Deck 7 portholes sit at a height that catches the bioluminescence on tropical nights. Bioluminescence is the blue-green glow created by microscopic organisms in warm ocean water when disturbed by the ship's wake. From Deck 7, your porthole is close enough to the waterline that on the right nights you can see the water glowing blue-green directly outside your window. Higher cabins are too far from the waterline to see it. It does not happen every night — conditions have to be right — but when it does, Deck 7 guests get a private light show that nobody above Deck 9 can see. Cabin 7310 is perfectly positioned for it.