Wouldn't have thought the surface was so soft.

I wonder if the wheels just spun out, or dug in. And how many they had driving at any one time as opposed to idling.

I suspect a Rover with 6 wheels dug into the "sand" and stuck there for the rest of it's life, all systems "go", would be somewhat embarrassing.

("Sol 239. Opportunity's staff reports that the rover woke up to Lionel Ritchies "Stuck on You" for the 180th Sol. Today it will examine the grain of sand to the right of the other 1468 it has examined in the last 6 months. The only evidence of liquid water is the tears of frustration of the Opportunity handlers.")

Kinda intriguing.

Arf