Careful reanalysis of data from more than a decade ago indicates that Saturn's biggest moon, Titan, does not have a vast ocean beneath its icy surface, as suggested previously. Instead, a journey below the frozen exterior likely involves more ice giving way to slushy tunnels and pockets of meltwater near the rocky core.

Data from NASA's Cassini mission to Saturn initially led researchers to suspect a large ocean composed of liquid water under the ice on Titan. However, when they modeled the moon with an ocean, the results didn't match the physical properties described by the data.