This guy looks really, really lost. He's wearing a space suit and carrying some kind of high-tech air-gun, but he's underground rather than in outer space. Looks like he should have taken that left turn at Rigel Seven.
Despite what you might think, 'spelunking astronaut' really isn't that great of a band name. It's more likely to turn up as a slang term for some disgusting sex act.
— Spelunking Astronaut, The Kingdom of Loathing