Open invitation to tender, deadline 21/10/2025 ,  for geodetic and geotechnical monitoring in operational tunnels in terms of monitoring the static stability of tunnel tubes and portal structures. The competition is composed by two lots:

• Lot 1, including the following tunnels Sitina (1.4 km) on D2, Bratislava Lamacska cesta - Stare grunty section; Povazsky Chlmec (2218 m) on D3, Zilina (Strazov) - Zilina (Brodno) section; Horelica (605 m) on D3 I/11 Cadca - Oscadnica section; Svrcinovec (420 m) and Polana (898 m) on D3, Svrcinovec- Skalite section; Ovciarsko (2.367 m) and Zilina ( 687 m ) on D1, Hricovske Podhradie - Lietavska Lucka section.
• Lot 2, including the following tunnels on D1: Borik (1 km) on Mengusovce - Janovce section; Branisko (4975 m) on Beharovce - Fricovce section and Presov (2 km) on Presov West - Presov South section.

Click here for bid documents and here where tenders must be sent. Value of contract EUR935,481, excluding VAT. Duration of contract 48 months. Contact Narodna dialnicna spolocnost AS, Bratislava, tel +421 (0)258311111, email zuzana.malcek@ndsas.sk. Visit https://ted.europa.eu/en/notice/-/detail/647756-2025 and https://ted.europa.eu/en/notice/-/detail/598117-2025. Ref.n. 13/10302/2025. 41/25.