In March 2000, the director of the British School at Rom, Professor Andrew Wallace-Hadrill, and the Soprintendenza and Comune di Roma, commissioned a geophysical survey over part of the Colle Oppio in the centre of Rome.

The trial resistivity survey was partially successful in identifying potential archaeological structures associated with the Baths of Trajan. Results were more successful on the ground to the south and east areas of the park, where the depth of archaeological deposits is significantly less than across the more elevated areas of the park to the north. The lack of any recognisable archaeological features in the survey results in the north and north east of the park suggest that resistivity, certainly utilising a twin prove array, would not be an effective method of mapping sub-surface remains of the Trajanic baths across the entire archaeological park.