Perhaps the conditions were above your potential but I handled the diving both inside and outside the reef at Ft. Hase between the years 1968-1970. Plenty of bugs and lead to make diving weights. Japanese glass balls were abundant if you knew were to look. We did. Still remember my 34 y/o mom (seemed old) climbing down the cliffs at the rifle range to the beach at 0dark30. We scored the killer glass balls that day, mortar rounds be damned.
The biggest problem with Ft. Hase was that it seemed to attract a large number of Portugese Man-O-Wars, which sting like a @