Modern diving technology is yielding new surprises from a Roman shipwreck that was explored more than a century ago and yielded part of what may be a complex astronomical calculator that was used to create a lunar calendar and predict planetary movement. The ship, which sank in the Mediterranean at about 67 B.C., is now believed to be twice as large as originally estimated. "Divers a century ago just couldn't conduct this kind of survey but we were surprised when we realized how big it was," said Brendan Foley of the Woods Hole Oceanographic Institution in Massachusetts.

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