"Pits" found on the moon:
http://www.newscientist.com/article/...-the-moon.html
Opening to what seems to be a lunar lava tube has been found. it
seems to be a pit over 80 m deep.
Considering that such lunar lava tubes are probably the key to
establishing a permanent lunar base, exploration of this should be a
high priority.
How to do this on the cheap?
Back in the early Gemini program, there were plans to use Gemini as a
way to get men on the moon as early as 1966 using a single man open
cockpit lander.
http://www.astronautix.com/articles/bygemoon.htm
A variation could be resurrected using the Falcon Dragon capsule or
the new NASA capsule launched atop either the Atlas V or the new large
SpaceX launcher.
This would be a very high risk mission with the person going from
earth to the moon and landing on the moon by himself and then
descending this deep hole by himself. The person would have to be
happy being alone for long times and comfortable descending deep pits.
PICK ME, PICK ME, I VOLUNTEER. Single handed sailor, experienced
vertical caver. This would be the ultimate caving trip, after doing
this, nothing else would ever be necessary. If things fail and death
is likely, well, just give me a small cylinder of CO. This could be
the ultimate contribution to humanity.