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I am wondering if i can use sonar in a cave , in a submerged part of the cave ,any suggestions?

i located deep in a cave in an underground river a vast room of artifacts , all completely submerged in a room located thirty feet down a tube , it was very difficult to photograph with the tremendous currant to get positive identification of the objects, i desperately need to verify these objects, one object appears to be a chest chained in place. this is in massachusetts. possibly hidden plunder from 1777. if anyone can help steer me towards a system to verify my find, i would certainly appreciate it. matty

3 Answers

Sonar has been used in Florida caves to map large caves. The sonar was attached to a underwater scooter and the sonar pulses were recorded and later used to map the size and direction of the cave passages and rooms. There is also a hand held sonar unit on the market.(check divestores). It is used to find something that is sticking out of the bottom or finding a lost buddy. If you have a lot of current perhaps diving during the dry season like late summer might help. Any kind of cave diving can be dangerious and needs a lot of perparation and backup support. Different cave dives can present different dangers. Please take a cave diving course before you make any attempts. Low vis, high current regular dives can be hazardous. Add to that mixture inside a cave and you have a deadly combo. Don't become a statistic.

I thank you for your reply. I dont intend on diving . I would like to verify what I saw and photographed with a ice fishing camera and a digital video recorder. I was hoping there would be a sensor that I could attach to a pole and probe with it while watching a monitor.Lets say it was down a two foot wide tube 25 feet in, lies a room about 25 feet around. Now If a cannon , or lead balls , etc etc. My problem is the absolute darkness in a cave , number one, the currant is very strong, leading to poor control of the camera or sensor. Three is snow storms of sediment obscuring the view , and sometimes covering objects almost entirely. thanks matty

If a fort was under attack any valuables might be dumped down a well. This solved two problems one it was quick and a small explosive charge would seal the well. The sealed well delayed the enemy from getting their hands on any valuables. That gave the fort time to send for help. Your problem is strong current and how to control any video device. There are small ROV's that have lights but they cannot handle much current. In late summer their might be a lot less current to put up with. If you contact dive operations you might be able to rent an ROV. Kicking up silt is a problem but if you have current it should blow away. Just lowering a camera would be very hit or miss. You could lower a large weight on a rope and then have the camera and lights slide down the rope. This would keep the camera from getting swept away but it would be difficult to keep in a certain direction unless it is attached to a long pole. Check with your hardware store and check the lengths of poles that screw together and are used to clean chimneys. Good luck and I hope this helps.

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