"Darc" by Underworld is a live recording track (Amsterdam 2005) also played on live broadcast from backstage at Guildhall in Southampton (UK), 8th October 2007.
It can be found as studio version under the name of "Parc" (4:17) on "The Bells, The Bells" a Japanese CD release only (2008)
More Underworld rare and unreleased tracks on my channel. Enjoy!