Sounds weird, my excal howled like a dying cat as my friend swam by with an infinium on, im used to interference but never this, so ive check all the obvious battery, battery from another excal my battery works on another excal and when I turn it on it humms whines like the cat and shuts down. Anyway I believe that the Infinium may have buggered the workings on the excal, I called Minelab they were good, said it was possible .... my question here and not on the detector forum is because its diving related and if I have to sss..t myself anytime someone swims near me with a garret I need to think about it. Ideas , opinions?