Thx all of you for answers....had my doubt that it could be detectable.
Tom and skywave: never had the pleasure of that kind of 'service message' you give your passengers...excellent
It's rare nowadays, and many of us actually appreciate a little more info, than just weather at destination and TOA.
Only had the chance once to sit in front - seat 4A - on a IA A320 landing at 11.500 feet in Leh India ...don't remember hearing any bell ringing.
Awesome flight over the Himalayas and approach in the indus valley:
YouTube - Approach Leh Ladakh (IXL)
(can't show video only the link)