NASA used its Lunar Crater Observing and Sensing Satellite,or LCROSS, to look for water deep beneath the lunar surface.

VOA: special.2009.12.30

"It is also a very deep crisis, its not just a wide lake - there is also depth to it."

VOA: standard.2010.03.01

"This capability allows the Strike Eagle to fly undetected, deep into enemy territory and deliver its ordinance."

VOA: standard.2009.11.15