Jumbo Piston Coring (JPC) from mid-sized vessels is an accepted economical technique for gathering seabed sediment samples. The TDI-Brooks JPC system can penetrate 20 meters and retrieve up to 19+ meters of sediment column. Now, with the development of the TDI-Brooks CPT Stinger the JPC system can be used to push a cone penetrometer up to 16 more meters beneath the nose of the embedded JPC. As a result, in-situ CPT data can be acquired from sediment depths nearly double of that attainable from the JPC alone. In practice, the standard JPC core liner is replaced by the CPT Stinger with its self-contained power, control, and logging module. The JPC is deployed in the same manner as if acquiring a Jumbo core. After trigger near the seabed, free-fall cone data can be acquired during the initial 3-second corer ballistic penetration into the seafloor. After penetration, the cone data acquisition continues for a programmed time. During this phase, the probe is extended deeper into the formation at a controlled rate of penetration of 2 cm/sec. Data from the probe are logged as the test progresses.

Once complete, the system is retrieved to the vessel and data are downloaded from the probe for evaluation and analysis. The control module is then serviced and the tool readied for the next deployment, typically in less than one hour, making multiple deepwater deployments per day feasible.