If you drop them in the river accidentally that is not deliberate. Now if you throw them in the river that is deliberate.
They should be able to survive a dunking.
I recall reading an article written by Terry Wieland in "Gray's Best" magazine about testing hunting binoculars for waterproofing in Alaska. He was the magazine's Shooting Editor.
He would tie a 10 foot or so cord to the binocular. Then he would walk out on a dock; tie the end of the cord to a pillar and drop the binocular into the water. The next morning he would pull it up and if it was still working and its insides were free of water it passed the test.
Bob
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