The digs04.zip file you have requested: Maps Levels Missions / Single Player / C to D Titles / Digs 04 - 3.23mb is not available. Perhaps try browsing all files for the game Quake and upload any files you want to share or are missing. This is the only information we could locate:
A single player map for Quake. It reloads itself with new monsters and a different starting point for 3 times. The exit teleporter counts.