EE WAS ENTERING TUNNEL WHEN HE SAID HE SLIPPED AND FELL. ANOTHER EE HEARD HIM YELL AND FOUND EE ON HIS BACK ON TUNNEL FLOOR. THE FLOOR WAS WET BUT NOT UNDER WATER OR COVERED WITH ROCK. EE WAS TAKEN TO ER WHERE HIS LEFT FIBULA WAS FOUND TO BE BROKEN AND LEFT ANKLE SPRAINED.