N-S 82 Březinka, Military bunker in Náchod, Czech Republic.

The N-S 82 Březinka is a freestanding, two-sided two-storey infantry blockhouse built to resistance level II, its height stepped because it stands on a slope. Its left main guns covered the Běloves valley and the road to Náchod, its right guns fired toward N-S 81 Lom and the Dobrošov fortress. It was concreted continuously from 4 to 9 October 1937, holds 1,365 cubic metres of reinforced concrete and has a 61 m drilled well.

The bunker was built in 1937 as part of the Czechoslovak defense system. The 1938 mobilization demonstrated how quickly such fortifications could be drawn into conflict.

In the left firing room since 2003 stands an original 47 mm fortress anti-tank gun model 36, returned from Norway's Oscarsborg fortress; it was originally installed at Březinka itself. The site also keeps a functional 1938 filter plant and a Royal water pump found at N-S 91 Rozhledna.

The bunker is reachable on foot from Běloves Spa or via marked hiking trails from Dobrošov fortress. It is best visited during dry weather, as bunker chambers can be damp.

The structure contains a working well system that has remained operational since the 1930s. This technical detail shows the engineering capabilities of that era and was critical for supplying the bunker during extended operations.