Okand entered the Trench in an attempt to blow up the Death Star after Garven Dreis failed. He went in alone, and also took the long way around. Hol assumed, correctly, that Vader and his wingmen would go after that new kid's fighter instead, and he'd be able to reach the target without hindrance. Unfortunately, not only did going that way take him much longer to reach the target, but Luke was also successful in blowing the station up while Hol still had several kilometers to go. He was killed in the explosion.