I am not sure of the veridicality of many supposed finds of krises in rivers (I have seen several videos showing krises very very corroded rescued from the bottom of bodies of water) or in the forest but apparently “ burying “ a kris in water or earth is a way to deal with a kris that is no longer performing his function.
Anyway, most of these videos are in Indonesian ( and difficult to find back, to me)
https://www.youtube.com/watch?v=QiWh4Y_AHq4
Bear in mind that the kris has become an industry in Indonesia and that “ old” or supposed to be old, pieces are sold at a premium there ...so there may be the temptation to make “ antiques “ and find them...
check this video search on Youtube for " Keris Metal detector “....lots and lots...
https://www.youtube.com/results?sear...metal+detector