In 1948, the German Federal Post Office (Deutsche Bundespost) began operating a microwave radio station at the summit. In September of that year, three artistes walked a steel tightrope stretched between the East and West Summits. Two members of the Traber family traversed the same route in 1953 on a tightrope on a motorcycle. Since 1953, an annual Gatterl Mass (Gatterlmesse) has been held on the Gatterl mountain to commemorate the four members of the Bavarian Border Police who died in an avalanche in 1952 as well as all those who have died on the Zugspitze.