The Lunar and Planetary Science Conference announced on 2015-03-16 that a 198 km wide crater has been found on the moon using the GRAIL spacecraft that uses gravitational field mapping. This enabled the discovery of craters below the surface. It's been named the Earhart crater. Nice gravitational photos can be found in the links.
(Score: 3, Informative) by bob_super on Friday March 20 2015, @04:20PM
If you have an atmosphere, you could argue that the amount of air contained inside the crater is massive.
But in this case you're wrong, because TFS is about a crater below the surface. So its content is massive.