JoongAng Daily article:
The Korean Institute of Geoscience and Mineral Resources detected the seismic wave of 1.4 to 1.5 magnitude underwater when the Cheonan was presumed to have ripped in half.
Such magnitude is equivalent to an explosion of 170 to 180 kilograms (374 to 396 pounds) of TNT.
The minister added that a marine who recorded the footage with a thermal observation device on Baengnyeong Island, which was near the explosion in the Yellow Sea near the inter-Korean border, saw a type of water column that erupts after a torpedo blast.
The South Koreans have called-off all rescue attempts.
ABOARD THE USNS SALVOR, Yellow Sea Clear skies and a billowing sea Saturday were not telling of what was beneath the surface: brutally strong currents, frigid temperatures, and water so murky that divers would barely be able see in front of them if they had to go in.
Those conditions, U.S. Navy divers and officials aboard this rescue and salvage ship said, are expected to persist and will make salvaging the wreckage of the South Korean patrol ship Cheonan that mysteriously sank more than a week ago unusually difficult.
?This is a very challenging dive scene,? said Capt. Charlie Williams, commodore of Destroyer Squadron 15, operating out of Yokosuka Naval Base, Japan.
Since the explosion, S
hence my much earlier post that the Captain, XO and Watch/Bridge Officers are critical for statements.
The captain being in his ward room seems to indicate that as far as they were initially concerned it was a business as usual run, otherwise he would have stayed on the bridge if they were entering a loc that was of interest.
Williams said he did not know when that would be, but the U.S. would be ?using all capabilities? during the salvage of the sunken ship and the recovery of any bodies trapped inside.
clearance/EOD divers won't go in first - the searays will go in first.
I think DA was only suggesting that it's entirely possible the ship's hull breached from contacting a wreck or natural object, rapidly filled with water and snapped its spine. Me, I suspect the NorKs meticulously scripted the event based on years of observation and planning. When the little flotilla changed course for behind the island the NorKs dispatched one of their stealthy semi-submersibles based in the area (reportedly they have 20-some stationed nearby) which sprinted under radar cover of the island to a set firing position and submerged with only a periscope and whip above the waves. Shore-based surveillance may have contributed. Ships rounded the island and the NorK boat launched a single passive homer that crept at quiet speed toward the predict point, picked up the engine or prop noise and then struck and shattered the keel. The NorK boat waited, saw another ship heading its way, popped up, sprinted for friendly waters and fired-off decoys at intervals, which blew around in the winds. Sokcho felt it had enough information to open fire and shot up the "birds." The untouched NorK boat sped to the coastline where it masked and worked its way back, at night, to the staging area/pen. Very Clancy-esque and far more intriguing than hull breach. And not any less likely at this point in time given the other scenarios speculated upon. The NorK/Iranian semi-submersibles/speedboats are a really difficult problem to counter in the enemy's backyard. A Cheonan-type event is exactly what those boats were designed to accomplish. 0.02
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