According to the Tender Dossier, section IV.7), also the subcontractor shall provide “evidences specified in section III.1.1. Section III.1.1. regulates the depositing of a tender security. Kindly clarify whether this means that also a subcontractor – in addition to the bidder – has to submit such tender security in the amount of EUR 10.0

No, only the company or the leader of consortium should submit the tender security.