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PROFESSOR: Let us
assume for a second

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that this cardboard box I hold
in front of you is a ship.

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Let's say it's a box barge.

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It kind of looks like a barge.

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Now what I've done for
you is drawn a water line.

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And what that is, is that is the
level at which the barge will

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float on top of
the water, assuming

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that it's going to float.

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Now, if I take these
scissors and create damage

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to the ballast section of
this barge, what do you think

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would happen?

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You'd probably be
right in saying

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that water is going to
go through this hole

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that I've created,
fill up in the barge,

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and that the barge
is going to sink.

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Now let's take that same
scenario and do it again.

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So we're going to damage
this bow portion right here.

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Now what do you
think would happen?

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You'd probably say that,
well, you just did that,

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so it's going to sink.

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Water's going to
come in that hole,

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and it's going to sink the ship.

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But you'd be wrong.

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What I did is I took these
cardboard pieces right here

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and subdivided the vessel.

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And what that means is
that when water comes in

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through this hole,
it's just going

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to fill up this compartment.

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Now, what that's
going to do is it's

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going to cause a trim
condition in the barge,

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but it's not going to sink.

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And people on
board are not going

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to be injured as a result
of the vessel sinking.

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Now, I show you this
example as a segue

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into what naval architects do.

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One of the most important
features of designing a ship

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is making sure it's not going
to sink as easy as it sounds.

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And the way that you do
that is through subdivision.