impressive if true
As Dan Rather would say, "Impressive even if untrue!"
I'd like to know exactly where these twits say the Straits of Malacca were 4000 feet deep before and now only 100 feet deep.
At the narrow point near Singapore, the Strait was always shallow.
To the northwest, perhaps it was (is) deeper. It certainly is much wider.
If a water column in the Straits of Malacca of several thousand feet were displaced as described, the ensuing tsunami within the Straits of Malacca would have wiped the coasts abutting the Straits from the face of the earth, including Singapore.
But, we know that there was NO significant tsunami effect in the straits.
From this we can conclude the obvious. The story is unadulaterated BS, and nothing more.
LOL