. >> how have these paintage, for the most -- paintings, for the most part gone uninnocence said. >> unnoticed. >> it's because most of the paintings can't be seen by the naked eye. >> what they lack, they make up for in historical significance. >> i open them up on the software. >> this man was working as a volunteer during the university break. he noticed red pigments on a wall. as a rock art researcher he knew of technology that can make the invisible vis uble. the computer programme is used by n.a.s.a. to study the rocks on mars. i take a photograph of the rock on the wall. i put it though software. what that does is change the colour in the image. it's xaj raying the colours. so things that can't be easily seep with the eye are made -- seen with the eye are made clear. >> reporter: 200 wall paintings are being studied. the job for the historians is to make sure that the new-found anchors are known. >> millions that come to the temple take a closer look at the wall. . >> have you wondered what is it like to spend a month at the bottom of the sea? jaust knows -- jacques yves coust