When it comes to synonyms for "splashed down," there are a few options to choose from. One possibility could be "landed in water," which conveys the same idea of a landing taking place in a body of water. Another synonym could be "water-landed," which combines the two elements of the landing. "Splash-landed" is another option, which emphasizes the watery nature of the landing. Other phrases that could be used instead of "splashed down" include "made a water landing," "touched down on the water," or "landed in the sea." Regardless of the wording used, all of these synonyms communicate the same concept of a plane or object coming to rest on the surface of water.