A phased approach was chosen for the LTD project, with Phase 1 running from 2004 until 2008. At the end of Phase 1 it was agreed by the partners to continue with Phase 2 and a second in-situ diffusion experiment.

LTD Phase 1: 2004 to 2008

LTD Phase 2: 2009 to 2013

LTD Phase 3: 2014 to 2018

Long Term Diffusion project (LTD) Experiment