NASA and Boston Dynamics have found an answer: Fully autonomous robots.
Caves are one of the most likely places to find signs of both current and past life on other planets because they are capable of protecting life from cosmic rays and extreme temperature fluctuations around our solar system. A NASA project called BRAILLE is now working on exploring Mars-like caves that already exist on Earth in order to hone key technologies for future missions.
According to researchers, the project has enabled the first-ever fully autonomous robotic exploration of these types of caves, which are several hundred meters long and limit communication with the surface. (CBS)