I will try again when I am feeling brave.
I may try at a different site - I have to admit that the 0 visibility and jumping into deep water really scared me, and although it got easier after the first time, it was still very difficult.
Last time I did the mask clearing thing, I said I would never do it again. I really wish it could stay that way.
Sara, Horsea Island is mid-south, in Portsmouth. It is a seawater lake, about 6m depth and a popular dive site.