The movie follows Angkor Vallis into the large crater Kofi (136 km diameter, centered at 56.74°N, 118.08°E), which has been flooded with lava.
The second part of the movie illustrates the remarkable range in elemental abundances displayed by the volcanic deposits that make up Mercury’s surface.
In these global views, the Caloris impact basin is initially in the center, and the colors on the spinning globes represent the ratios by weight of magnesium to silicon and aluminum to silicon.
Silicon is known to be relatively homogenous across the surface, so these maps demonstrate variations in the abundances of magnesium and aluminum, both of which are sensitive to the details of the interior melting that produced the lavas that formed the surface volcanic deposits.
During parts of a Mercury year, the radiation pressure from the scattering process is sufficiently strong to strip much of the atmosphere and form a long glowing tail.