The steep slope of Pekařská Street has been a challenge for tram traffic in the past and has complicated the traffic situation for cars and trucks. The proposal to solve this was part of the so-called ‘fast tram’ project. In essence, the project involved the construction of a tunnel under Špilberk Hill connecting the lower part of Pekařská Street with Joštová Street. The total length of the proposed route was 650 metres; the tunnel was to be 10 metres in width and height. In the first phase of this work, the exploration of the ‘left heel’ of the tunnel was started in Pekařská Street in 1978. After completing nearly 500 metres of the planned route, the whole project was stopped in 1979. The reasons for this decision are not clear, but it seems that the planning priorities of that time shifted to other areas and the fast tram project lost its relevance. Of the whole project, there was left only a vacant lot on Pekařská Street and an abandoned underground entrance overgrown with bushes at the foot of the slope.

The reinforcement from steel panels and reinforced concrete slabs is partly corroded and deformed by the pressure of a massive weight. On the walls of the concrete slabs, white karst formations of calcium deposits shine. A pond also formed on the rocky foundation. Even at first glance, it is clear that the construction of the tunnel required considerable effort. This was also confirmed by people who witnessed this special construction.

The tram tunnel under Špilberk is one of the most recent underground structures made into the rock foundations under Špilberk Hill. Its fate is hard to predict today. Although the intention to run the tram route through the Špilberk rock has not been ruled out, and perhaps it will happen in the future, the question remains whether the existing tunnel can be used for this purpose.