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One Pound Plus a Little  That's right. For the sub to sink, it needs to weigh MORE than the maximum weight it can displace. By adding one pound of sand plus a little more, the sub's overall weight is just over two pounds. On to Puzzler #2... Puzzler #1 | Puzzler #2 | Puzzler #3 Stories in the Timber | Explore the Shipwreck | Who Owns Lost Ships? Buoyancy Brainteasers | Teacher's Guide | Resources | Transcript | Site Map Voyage of Doom Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |