Hand Deeps (50º12.425 N, 004º20.445 W)
The shallowest part of Hand Deeps is a kelp-covered flat-topped pinnacle sitting some 10m below the surface, but its rocky terrain plunges down to more than 50m.
There are some fantastic rock formations covered in jewel anemones, and the rock face is quite sheer in some places. There are gullies, coves in the rock and extensive boulder plains with sea fans, wrasse, congers etc. There is also no freshwater run-off from land out there, which can give really good visibility - but occasionally there are plankton blooms.
There are several different locations to drop-in and, if you have time or are waiting for slack water, a few runs with the echo sounder can pay-off with a spectacular dive. The site is well known to Plymouth Sound Dive Club and can be dived at any time during neap tides, but slack water is advised during springs and is two and a half hours after high and low water at Devonport.