It was planned at the beginning of the 1970s to build a completely underground network with a length by 15 km and 22 stations. However, due to financial difficulties only 11 stations have been built. The network is now operated by De Lijn.

The first 1.3 km section opened on 25 May 1975 between Opera, Meir and Groenplaats. Further sections were opened in 1980, 1990, 1996 and 2006. The newest station is at Schijnpoort in the northeast of the system.

De Lijn opened the tunnels for public tours. A great unique occasion to take a look ;-) (less info)