A new set (10) for the inspection of the cathodic protection conditions of subsea pipelines, including: - a device or probe (11) with two reference electrodes (12a, 12b) for measuring a potential difference (V) or electrical potential gradient in close proximity to a subsea pipeline (CS) to be inspected; and - a probe (20) for the execution of contact potential measurements and of resistivity measurements of the seabed where the subsea pipeline (CS) to be inspected is buried, wherein the set (10) is characterized by a configuration where the device or probe (11), with the reference electrodes (12a, 12b), and the probe (20), with a contact tip (22), are separated and constitute two distinct and independent components which thereby can be separately arranged and positioned in the execution of the inspection of a subsea pipeline (CS), and wherein the two reference electrodes (12a, 12b) of the device (11) are fixed to a support frame (13) of the probe (11) with possibility to adjust the distance (D) between them (12a, 12b). The invention covers also further innovations, derived by the previous one, in the same field of the cathodic protection of subsea pipelines, like a new probe (20) for the execution of contact measurements and in particular of resistivity measurements of the seabed (FM), where the subsea pipeline (CS) to be inspected is buried, and of the seawater; a new assembly (40) for measuring the electrical potential along three spatial directions; and a new system (50) to unwind and to recover a cable, for an electrode, connected to a submarine vehicle of the AUV type.
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