Offshore geotechnical investigation for two (2) jack-up rig locations and two (2) platform installation sites at the Diyarbekir Field and Turkmenistan Block 1 Gas Development, Offshore Turkmenistan, Caspian Sea, for Petronas Carigali Turkmenistan in 2010. The works included two (2) pilot holes, two (2) boreholes to 110 m depth, and fifteen (15) CPTs to 15 m penetration, undertaken onboard MV Neftegaz 58.