The Giga Burr was designed by Bill Cutler and was used as his exchange puzzle at IPP19. There are 248,540,292 different 3X3X3 3-piece burr assemblies. The highest solution level is 8 and Giga Burr is one of them. Furthermore, there are only 3 that have 9 internal voids 2 come apart two ways and 1 comes apart one way. Giga Burr comes apart only one way!
"From late 1998 until April, 1999, a computer analysis of all 3x3x3 3-piece burrs was run. There are 248,540,275,292 different such designs. The highest level solution found was 8, and there were 80 such solutions. These solutions came apart in two different ways. One of these was chosen as a souvenir puzzle and named GigaBurr, and one which comes apart in the other way was made as GigaBurr II. This was my souvenir puzzle at the 19th International Puzzle Party." -Bill Cutler