A few weeks ago the emergency services were called to
because members of the public heard a repetitive knocking and banging sound
coming from beneath their feet. They could hear it emanating from below the
pavement when they stood near manhole covers. The fire brigade managed to open
one of the manholes where the noise was coming from the most but could see
nothing untoward, or so they reported. They lacked the equipment and skills to
carry out a more thorough investigation, and strangely no specialist unit appears
to have attended in their wake. This response is made more suspicious because a
passer-by told the local press that these noises have been recurring for quite
a while, see: http://www.msn.com/en-gb/news/uknews/theres-something-in-the-sewers-mystery-as-tapping-noise-beneath-street-sparks-probe-by-police-and-fire-crew/ar-AAo25wm?li=BBoPWjQ.
However a private inquiry was carried out by a local historian and paranormal
researcher, Richard Felix. He discovered a network of mysterious tunnels under
the street in 2009. Could there be a connection? Source: http://www.derbytelegraph.co.uk/could-derby-s-secret-underground-tunnels-be-linked-to-knocking-sound-in-tennant-street-near-quad/story-30191956-detail/story.html.
I wonder if there might be a cryptozoological link as well, see: http://hpanwo-voice.blogspot.co.uk/2016/10/monster-in-sewer.html.
Richard Felix was a speaker at the recent Paraforce UK 2016 where I also spoke,
(Apologies HPANWO Voice hasn't been updated for a few days. I've not had time) Derby, UK
See here for related stories: http://hpanwo-voice.blogspot.co.uk/2015/10/underground-city-discovered-in-mexico.html.