[1] In 1847, the railroad was built, eventually becoming part of the line between Hanover and Hamburg, and a station Unterlüß was created, causing a settlement around it.

In 1899, the company Rheinmetall (then Rheinische Metallwaren- und Maschinenfabrik Aktiengesellschaft) first installed a shooting range and then began manufacturing weapons.

When World War II began, Polish forced labourers were used, and from 1941 also Soviet ones (and finally Jewish deportees).

Once the SS guards fled, most of the prisoners (except a few who escaped) were forcibly removed back to Bergen Belsen by local civilians.

In 2019, an activist group, SIGMAR 2, blocked Rheinmetall in Unterlüß in protest against the export of weapons to Turkey.