The paper describes a foundation problem associated with a tanker berth at Das Island in the Arabian Gulf. The tanker berth, to accommodate 200 000 ton tankers, was constructed in 1967 using high tensile steel tubes drilled into the sea bed to form mooring and berthing dolphins. A jack-up platform was used for the installation of these cylinders and this platform subsequently became part of the permanent installation as the central island. Site investigation borings were sunk at the locations of each dolphin and calculations of the lateral resistance of the dolphin cylinders were made. The location where the lowest lateral resistance was indicated was chosen for a full scale site pulling test. The results of this test are described in the paper together with the methods used for the installation of the mooring and berthing dolphin cylinders.