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Scientists talk about the possibility of life underground on Mars, and I assume they are talking about microscopic life that can live in small gaps in the soil or rock. But is there any evidence that there might be large caverns under the surface of Mars relative to the human scale or even larger?

Then I wonder how could we even detect or map such subsurface features on Mars or other rocky bodies in the solar system such as Titan, Venus, or even the Moon. Could we use radar or maybe sonar for bodies with substantial atmospheres from an orbiting spacecraft? Are there other methods for detecting sub-surface cavities?

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Large lava tubes have been found on Mars: en.wikipedia.org/wiki/Martian_lava_tube Underground life on Mars should be measurable by its release of methane into the atmosphere, which has not been conclusively detected. –  LocalFluff Jun 29 at 14:59
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Since water is known to be on Mars, and used to flow on Mars, and flowing water has created caverns on Earth, I would say caverns on Mars are quite likely. I would be interested in seeing future space missions to detect them. –  Jonathan Jul 1 at 15:43

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As evidence of caverns detected on Mars, consider the following recent image taken from HiRISE instrument on the Martian Reconnaissance Orbiter :

enter image description here

Image source: NASA

Scientists believe that

The hole appears to be an opening to an underground cavern, partly illuminated on the image right. Analysis of this and follow-up images revealed the opening to be about 35 meters across, while the interior shadow angle indicates that the underlying cavern is roughly 20 meters deep.

Which accompany larger openings, reported in the National Geographic article Mars Has Cave Networks, New Photos Suggest (Norris, 2007) of several larger pits detected by Odyssey, and they offer a possible origin:

The surface of Mars is strewn with craters from meteor impacts and depressions formed by the collapse of underground chambers formed by flowing lava, the experts said.

There are many examples of lave tubes (and indeed, in other places in the Solar System), caverns etc reported in the article Mars Cave-Exploration Mission Entices Scientists (Wall, 2012), who also state, in regards to detection and exploration of these caverns that robotic means are being explored.

However, according to this NASA article, a method to find and characterise caves on Mars (or indeed Titan, and maybe other places, including the Moon) is to detect them via thermal differences caves cause in comparison to the surrounding surface. This method is used on Earth, and

Techniques developed through this research will ultimately be applied to locating subterranean cavities on the Martian surface. We anticipate one of the best techniques for systematically finding caves on Mars will be via remotely sensed thermal imagery.

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+1, Nice answer to an old question. Nice job on your other recent answers, too. –  HDE 226868 Sep 29 at 22:57

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