A system and method of tracking an object that is at least partly buried in seabed

A system for tracking an object that is at least partly buried in seabed, the system comprising:

• an Autonomous Underwater Vehicle, AUV, comprising:
• a hull,
• a first sensor assembly mounted on the hull in proximity to a starboard side of the AUV;
• and
• a second sensor assembly mounted on the hull in proximity to a port side of the AUV,
• wherein the first and the second sensor assemblies are configured to measure magnetic field data, the first and the second sensor assemblies separated from one another by a distance d in a direction that is perpendicular to a longitudinal direction of the AUV,
• a controlled active electric dipole source for transmitting electric current in sequences mounted on the hull of the AUV;
• and
• a processor configured to use measurements from the first sensor assembly and the second sensor assembly to estimate a position of a part of a buried object underneath or close to the AUV by inversion of the magnetic field data.