Berthold Seliger launches a rocket with three stages and a maximum flight altitude of more than 100 kilometres (62 mi) near Cuxhaven. It is the only sounding rocket developed in Germany.

The Berthold Seliger Forschungs- und Entwicklungsgesellschaft mbH (BSFEGmbH) was a company founded by West German rocket technical designer Berthold Seliger in 1961. Seliger was a former assistant theoretician professor Dr. Eugen Sänger. The company developed and built prototypes of sounding rockets and launched them near Cuxhaven. The BSFEGmbH cooperated strongly with the Hermann-Oberth-Gesellschaft, of which Berthold Seliger was a member. The first rocket developed by the BSFEGmbH was an improved version of the Kumulus, which was first launched on 19 November 1962 and reached a height of 50 kilometres. On 7 February 1963 the BSFEGmbH launched a two-stage rocket with a maximum height of 80 kilometres and, on 2 May 1963, they launched a three-stage rocket with a maximum flight height of more than 100 kilometres. The latter rocket may have attained the highest flight altitude of all rockets built in post-war Germany. The signals from all these rockets were also received at the observatory in Bochum. After May 1963 the BSFEGmbH worked on the improvement of the steering system of their rockets and thought also on military usable rockets.

Cuxhaven is a town and seat of the Cuxhaven district, in Lower Saxony, Germany. The town includes the northernmost point of Lower Saxony. It is situated on the shore of the North Sea at the mouth of the Elbe River. Cuxhaven has a footprint of 14 kilometres (east–west) by 7 km (4 mi) (north–south). Its town quarters Duhnen, Döse and Sahlenburg are especially popular vacation spots on the North Sea and home to about 52,000 residents.

A sounding rocket or rocketsonde, sometimes called a research rocket or a suborbital rocket, is an instrument-carrying rocket designed to take measurements and perform scientific experiments during its sub-orbital flight. The rockets are often used to launch instruments from 48 to 145 km above the surface of the Earth, the altitude generally between weather balloons and satellites; the maximum altitude for balloons is about 40 km (25 mi) and the minimum for satellites is approximately 121 km (75 mi).