ESA recently started the third round of a series of studies that focus on exploring lunar caves. The current round, called a concurrent design facility (CDF) study, builds on the work done in two previous rounds of Sysnova studies.
Originally encompassing five studies ranging from how to lower a probe into a cave to how to communicate with and power any probes that make that descent, ideas were elicited from the public as part of the CAVES and PANGAEA programs.
Understanding even the entrances of lunar caves can prove invaluable to understanding the resources that might be available in the subterranean world of the moon.
Source
Originally encompassing five studies ranging from how to lower a probe into a cave to how to communicate with and power any probes that make that descent, ideas were elicited from the public as part of the CAVES and PANGAEA programs.
Understanding even the entrances of lunar caves can prove invaluable to understanding the resources that might be available in the subterranean world of the moon.
Source