This is one of the four eNodeBs for Hochbahn LTE in the underground, located at Wandsbek Markt. The cells operate at 1800 MHz with 20 MHz channel width.
Cell 8 serves the following stations (and the tunnel sections in between):
U1 Wartenau, Ritterstraße, Wandsbeker Chaussee
Cell 9:
U1 Wandsbek Markt, Straßburger Straße, Alter Teichweg