Itâ€™s the final challenge and perhaps the most dangerous yet. The scientists have to make a SCUBA device so that Kate can descend safely to the seabed some 5m down. It has to be sophisticated enough to supply her with breathable air at the right pressure
The five scientists are taken to a mystery location in the Mediterranean. Their first challenge is to determine their latitude and longitude and thus pinpoint exactly where they are. They are also asked to create insect repellent and a radio.