Video: HP3 experiment will measure the heat flow in the interior of Mars. Source: DLR (CC-BY 3.0).

Video: HP3 experiment will measure the heat flow in the interior of Mars. Source: DLR (CC-BY 3.0).
The next mars mission will reach the Red Planet in 2016 to take a 'look' into the deep interior. It will do this with geophysical experiments including DLR's HP3, which will penetrate several metres into the Martian subsurface to measure the soil's thermo-physical and electrical properties.
Credit:

DLR (CC-BY 3.0)