How laser scanning may help crack mysteries of HMS Erebus

I have to admit i wouldn't have thought to use laser scanning under water but then, why not?If the water is clear enough it should work the same as in-air or in-space, give or take some minor modifications.

Because the thick layer of ice eliminates wave action, letting all the particulate settle at the bottom, archeologists considered the conditions prime for deploying the long-range laser scanner Parks Canada bought from 2G Robotics.

”We want to take advantage of the water clarity to do a very thorough baseline recording of the wreck site before any future interventions take place,” Ryan Harris, a senior underwater archeologist for Parks Canada, said in an interview earlier this month.