The wrecks were first identified by robots some 2km (1.2 miles) beneath the surface. The experts then used the latest technology to map and record the shipwrecks. "All the remains were carefully recorded using a suite of digital photography, HD video, photomosaics and multibeams" The Guardian reports the company's co-director Steven Vallery. Divers subsequently removed many of the more valuable items from the site and there was a treasure trove of objects retrieved.