Using radio waves, miners could remain in contact with surface operations.

Most of the questions centered around the surface operations, such what to the crew were the most important findings.

We had to suspend all surface operations because of the radiation.

In practice, overheating was the biggest risk of lunar surface operations, and cooling systems were easy to build.

I am in charge of surface operations, and don't you forget that!

Now he was responsible for surface operation as well as underground.

Its surface operation lasted 44 years, finally closing in June 2001.

It seems obvious to me that we underestimated the potential of our surface operations.

And then there are the power requirements for surface operations.

Trade them that for an unhindered landing and surface operations.