Prior to the construction of the new water pipe two horizontally-driven drillings were made under the Oude Maas river, with a length of 1,424 and 624 metres respectively. The pipe depth position was 25 metres under the Normal Amsterdam Water Level (NAP).
Once the pilot hole drilling - from the treatment plant in Zwijndrecht, via the Oude Maas river crossing to Dordrecht- was complete the drill hole was re-drilled (made larger). The pipe was prepared on the Merwede river bank and was transported over the water towards the drill hole (on the Dordrecht side). Next the pipe was drawn into the drill hole.
After the initial, longest drilling, a similar yet smaller drilling followed on the Dordrecht side to link up with the existing Evides network. The first and second pipes were connected by a third. This was realised by means of an open pit after the subsoil had first been sanitised.