Underwater inspection

Inspections and support activities are essential during the immersion of tunnels and caissons. This work is carried out by the experienced divers employed by our subsidiary OTN, who provide maximum support to the immersion supervisor.


Once the immersion process is completed, the divers dismantle the auxiliary equipment and perform thorough inspections of the area around the tunnel element. OTN has all the expertise and equipment required to perform this work both in the Netherlands and internationally.