The Andaman Sea is as much as 8,000 to 8,500 feet deep. That’s where I’d say it was headed if in fact it was shot down elsewhere. Elsewhere, possibly very shallow where much of the wreckage might quickly be recovered. Elsewhere, like the last radar contact over the Sea of Thailand, a scant 200 to 300 feet deep at most.
Yup.
I was dry land until about 7,000 years ago. The sea level rise 7,000 years ago opened up the Straits of Malacca and allowed sea travel to the west for the first time in few 100k years.