YC21 (Barge) - 550-ton wooden barge, which was being used in salvage operations on the F2.  Sank in a storm in 1968.  Lying just off the F2 in 16-20 metres, the barge sits upright on a silty bottom in 18 metres of water.  In her holds can be found one of the F2's anti-aircraft guns, as well as generators, compressors and oxy-acetylene cylinders.  Access to her workshops and holds can be gained through open hatchways on the deck, and a large hole in her bows.  Conger eels and edible crabs can be found in crevices, and scallops can be found on the surrounding seabed. 

F2 -  World War II German escort vessel.  Displaced 790 tons and measured 249 feet (82 metres) in length.  A Second World War prize, she sank at her moorings in 1946.  

Lying in 16-20 metres of water, she is a popular second dive.  Her bow section to aft of the bridge is intact and in good condition, and access can be made to holds.  The bow turret and gun are still in place, and the breach and inner workings can be seen.  Her stern section has been heavily blasted during salvage operations.