Octas is a Table Top Role-Playing game system based on the use of two 8-sided dice, numbered 0-7. It ostensibly uses the octal (base-8) numeric system, although this is largely hidden from players behind some simple conversion maths.
Octas/crash is a planned sci-fi genre-module for playing the game. It is presently not available, sorry. (I want to the fantasy-themed Octas/fallen at least basically-playable before getting side-tracked!)