OMMMMM… What is underwater meditation? Finding peace and solace underwater in the big blue ocean while freediving or scuba diving.
Breath control: Focusing on your breath, inhaling and exhaling through your regulator as you focus on your buoyancy control while scuba diving.
Relaxing your body and mind while freediving or breath-hold diving. Clearing out any negative thoughts in the mind to conserve more oxygen for the body. That is the challenge, similar to meditation, think of nothing.
And the most important thing is being present in the moment, focusing only on the NOW.