I used these on our last fatal boat crash to mark the most likely point of contact between the two vessels. One person was missing from the vessel, so it was very important to mark that last known location. The divers found the victim within 50 feet of where the marker was placed. The only request from the divers was that the weight should be a little heavier. They were very impressed that we were able to mark the location so quickly...it made their job much easier.
- J. Barnes