Archaeologists have built a replica Elizabethan cannon to find out how powerful English ships were at the time of the Spanish Armada.
The replica is based on an original cannon recovered from the only Elizabethan warship ever discovered, which was located off the Channel Islands.
Timewatch: Elizabeth's Lost Cannons is on BBC Two at 2000 GMT, Saturday 21st February.
Watch more clips at the Timewatch website.
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