Where is to keep additional lens underwater?

Hi!

Sometimes you need to detach (or attach) wide angle lens underwater from housing. What is the best and convenient way to keep it underwater?

This is the solution for Inon lenses:

http://www.inonamerica.com/products.php?pr...dcat=5&subcat=1

... and here's the one for Sea&Sea lens caddy (part 60101).

http://www.seaandsea.jp/products/accessory/acce/arm.html

They used to have one capable of carrying 2 lenses at once (part 03820) and was very practical, but apparently it's been discontinued. Mre details here:

http://www.seaandsea.jp/products/accessory/acce/niconos.html