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From: lavida (no email)
Date: Mon Jun 05 2006 - 12:56:47 EDT
I must disagree that "nothing floats a few feet under water".
Containers and other junk; in, on or under the water, have complex
buoyancy issues going on. You must consider the material inside,
trapped air, gas buildup, gas leakage, flooding, etc., etc..
All containers pass through the water's interface. Some quickly, some
not so quickly. Guess you could call it a random buoyancy control
system. This most likely leaves a number of invisible containers around
the world, waiting to do harm to a hull.
Back in the mid '80s I was aboard a 273' steel saturation dive/remote
vehicle vessel. It was broad daylight and the bridge watch was engaged
in searching for our autonomous underwater vehicle. It had recently
surfaced with a malfunction.
Out of no where there was a huge crash. Emergency sirens went off and
all hands went to stations. No one had any idea what had happened. A
quick check of the ship turned up an injured seaman, thrown violently
from his bunk by a huge imploding dent in the hull.
The Captain quickly deployed our onboard Remote Operated Vehicle, did a
hull inspection and found we had sustained a huge dent in the port fwd
quarter. The inspection found the perfect indent of the container's
profile, slammed into the side of the ship. We hit it hard enough to
bend one of the ships frames!
Lucky the hull didn't breach.
Rit
-----Original Message-----
From:
[mailto:] On Behalf Of Young, Derrick
Sent: Monday, June 05, 2006 11:18 AM
To:
Subject: RE: [world-cruising] the danger of semi submerged containers
>Nothing "floats" a few feet under the water. That's basic physics. If
it
>isn't on the top, it will be on the bottom.
I have hit and been holed by a floating log that was not visible on the
surface. This happened in the Albemarle Sound (North Carolina).
If the log had been fully saturated, it would have gone to the bottom
...but as long as the displacement is equal to the weight of the column
of water on top of it, then it will "float" at the point where they are
equal. The same goes for a container.
I have no idea how long a container would float (at or below the
surface) ... I do know that they will seal. At the port of Newport
News, VA and at the US Army Transportation Center (East - Fort Eustis,
VA) - they have inspectors that periodically test the integrity of the
seals - otherwise we would have a log of solders in the field that would
not receive (or receive wet/damaged) rations and other supplies.
derrick
[Non-text portions of this message have been removed]
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