Bunker Eichenthal, military bunker in Lindholz, Mecklenburg-Vorpommern, Germany

Bunker Eichenthal is a bunker complex of the Warsaw Pact's Bars tropospheric communications system, built in protection class D in the forest near Langsdorf in the municipality of Lindholz. It housed one of the four possible tropospheric radio sets and, in the NVA network, was designated Stütznachrichtenzentrale 302. It is one of three identical stations on former East German territory, alongside Wollenberg and Röhrsdorf.

The bunker was built from 1983 to 1987 in protection class D as Support Communications Centre 302 of the NVA, one of three identical tropospheric radio stations on GDR territory. Test operation began on 1 December 1987 under the cover name "Gromada", linked only to Wollenberg; cooling problems with the klystron transmitters delayed operational use until 7 May 1990. It was decommissioned on 2 October 1990, abandoned by the Bundeswehr in 1992 and sold to a private owner in June 2005.

The site displays remnants of military operations through preserved equipment and materials from Germany's division era. Walking through the rooms gives a sense of how soldiers worked in this underground setting.

Access is by guided tour, which allows visitors to safely explore the underground spaces and understand the layout of the various sections. Wear sturdy shoes since floors can be uneven, and temperatures remain constant in the depths.

The station was one of three identical tropospheric radio sites on GDR territory, alongside Wollenberg and Röhrsdorf. Unlike the others, Langsdorf received only one radio set, so it could maintain a single tropospheric link, to Wollenberg. A counterpart on Polish soil never existed, and the planned coastal axis was shelved.