One who traverses the quagmire.
Sid Barrett of early Pink Floyd fame, Frank Zappa, Captain Beefheart and everyone in Devo were some of the best known twentieth century quagmirnauts in the music field.
Andy Warhol got the film prize for Twenty Four Hours at the Empire State Building.
These people were not afraid to go into the mirky depths of the unkown, regardless of whether the out come was favourable, regardless of whether they passed through places where they weren't quite sure which was one or the other, they were pioneers and saviours becuase...
They had the GRIT to tame the quagmire!
*note: Those who read everything and follow as many softlinks as possible in multiple windows without going soft in the head are excellent examples of quagmirnauts