Rescue teams can not get down any more by running into a hard dirt plug, assuming he is under it.[39] On 15 January, a group of technicians and specialists was called, opting for the opening of a lateral and a horizontal tunnel between 50 to 80 m (160 to 260 ft), as the best option to reach Roselló. The preparatory works begin.[40] On 16 January, it is confirmed by DNA tests that hair from Roselló has been found inside the well.