It was about land mine clearing in Mozambique. They were using giant rats set up in harnesses for finding land mines. They’d hook the rat up to strings and do grid search and reward the rats with bananas when they found a mine. Then they’d blow it up. The rats are too light to set off a mine and seemed to enjoy it. This method is much faster than conventional searching with mine detectors.
Here they’re using them in Cambodia too.
https://www.abc.net.au/news/2018-05-26/hero-rats-clearing-cambodias-landmines/9799632