A1 Submarine fledermaus 2
The wreck of HMS A1, Britain's first commissioned submarine is a designated historic wreck under the Protection of Wrecks Act 1973.
This picture was produced by using multi-beam and single beam echosounders and sidescan sonar to map the different levels of the seabed. The data is put into a software programme called Fledermaus which converts it into an image.
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