There is no neccessity to jump to Frenzel (difficult to learn) from Valsalva (dangerous) when there are intermediate methods (Toynbee and Lowry) that are easy and often effective.Thanks for sharing that, and this is what I do on land, too. On my list of things to do (someday, haha) is figure out the Freznel method, which I believe to be different than the jaw thrust.
See 6 Methods to Equalize Your Ears - Divers Alert Network and Beat the Squeeze: Equalize Like a Pro - Divers Alert Network