The paper contains the case history of the installation and testing of offshore foundation piles in the Gulf of Suez in Egypt. For the installation of two offshore jackets for the oil and gas industry piles of over 100 m length had to be driven. Because of this length the piles were driven in sections, with pile driving monitoring throughout the entire installation. The soil investigation at the project site indicated the potential for voids at several depth as the cone resistance became as low as close to zero in a silt layer from 73,5 till 100 m below seabed. The papers show the results of the pile driving monitoring. At final penetration depth restrikes were performed to determine the pile capacity of the pile through a Dynamic Load Test (or High Strain Dynamic Test). The process of modelling the soil strata, the adjustments to that soil model as part of the signal matching process as well as a discussion of the generated test results are also presented in the paper.