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\subsection{Elements of Costing}  A detailed costing of the TLEP project does not exist yet, and one of the aims of the starting TLEP design study now starting is to produce it. Not surprisingly, the main cost drivers for the whole complex are expected to be the tunnel, the shafts and the related services and infrastructure (including access roads). The TLEP project, however, may be considered as a precursor to the VHE-LHC, in which case the corresponding cost would be shared between TLEP and the VHE-LHC. The  length of the tunnel will be optimized on the basis of geological and accessibility criteria. For example, a tunnel of 100 km (also shown in Fig.~\ref{fig:TLEP80}, and for which a feasibility assessment is ongoing) might be more cost-effective than the 80-km version.The TLEP project, however, may be considered as a precursor to the VHE-LHC, in which case the corresponding cost would be shared between TLEP and the VHE-LHC.  In a very preliminary estimate shown in Table~\ref{tab:cost}, the cost of the accelerator and collider rings, dominated by the 12~GV RF system and the 80~km of magnets -- possibly recyclable for the VHE-LHC injector --, was found to be smaller than the LHC construction cost. In view of the large number of Higgs bosons expected to be analysed at TLEP (given in Section~\ref{sec:Higgs}), the cost of each Higgs boson, namely 1.5~kCHF per Higgs boson for the construction and 2~MWh~\cite{1308.2629} per Higgs boson for operation at 240 GeV, is expected to be exceedingly competitive.