opened for traffic. The Trust had hoped that it would be possible to fix other points where the roof was particularly low, but there were insufficient funds for that. The Trust commissioned the construction of a new tunnel in 1984, running between the main tunnel and the Rock Tunnel, in order to provide access to the Singing Cavern. The cavern was formally opened to the public on 23 April 1985 by Neil MacFarlane MP and John Wilson, chairman of the MEB. By 1987, the number of visitors wanting boat trips meant that it was necessary to create a round trip route through the caverns. A connection was made between the Singing Cavern and the Little Tess cavern, by excavating part of the blocked Rock Tunnel, and a new tunnel was built, to link Little Tess cavern to Castel Mill basin. The work was completed in 1990, and the circular route was formally opened by councillor D H Sparkes, chairman of Dudley Economic Development Committee on 25 April. By 2004, between 80,000 and 90,000 visitors were visiting the tunnels each year. At the south end of the tunnel there was once a triple junction, where the Pensnett Canal and the Grazebrook Arm both joined the main canal. This was reinstated in 1995, when the Grazebrook Arm was dredged. A small part of the line of the filled-in Pensnett Canal was bought from the Lord Dudley's Estate, and a brick lining was constructed as it was excavated. The work included rebuilding the bridges which crossed the two arms, and resufacing of towpaths in the area. Because of its limited size, boats using the tunnel must not use diesel engines, and the Trust used to use a trip boat to tow them through, but in 1996 they commissioned a purpose built electric tug, so that they did not lose the use of a trip boat. It is named John C Brown after the British Waterways engineer who oversaw the reconstruction of the tunnel in 1992, and it has a diesel engine connected to a generator to allow the batteries to be recharged when not in the tunnel. The Trust were given use of the disused Blowers Green Pumphouse at the foot of Park Head locks in 1996, and converted it to become offices and an education centre with workshops and stores attached. By 2012, they had funding in place for a permanent headquarters