What exactly equals a Royal Flush while swimming recreationally in the ocean? Survival?
Maybe finding 4000 gold doubloons in an underwater cave? But it is hard to know if this is a good long term strategy or just profitable in the short term.
If you only are using one limb, the most you can hope to garner is about 250 doubloons.
I hadn't seen Eduardo's answer when I posted mine. On 2nd thought, I have to defer to his view of a Royal Flush … and what a view that might be!! Maybe my suggestion would be better suited for quad aces and a kicker while playing Triple Doubloon Bonus.