Intra BV delivered several Tubes with a total length of 27 meter each. To make sure that the Tubes were ready to use at the job site we included the extra service of welding the drill heads at the bottom of the Tubes. Because the Tubes are being installed in the historic harbor of Bunschoten-Spakenburg, they were installed vibration free by drilling. This made sure that the 273 years old monumental building would remain intact.