Fallturm Bremen

The entire tower, formed out of a reinforced concrete shank, is 146 metres high.

The 122-metre drop tube is free-standing within the concrete shell, in order to prevent the transmission of wind-induced vibrations, which could otherwise result in the airtight drop capsule hitting the walls.

The drop tube is pumped down prior to every free-fall experiment to about 10 Pa (~ 1/10 000 atmosphere).

In 2021, German and French scientists at the drop tube managed to produce and record the lowest temperature ever measured.

Using quantum gas, they managed to achieve 38 trillionths of a degree above absolute zero.