Move over jet skis: The new onboard gadget the ultra-rich seek for their superyachts are submersibles.

• The world's super rich have increasingly sought out superyachts in recent years.
• One way the ultra-wealthy are now accessorizing their luxury ships is with a submersible.
• These vessels can cost at least a few million dollars each.

Joyrides on jetskis while sailing the high seas on your giant yacht are so last year.

Now, the world's .01% are seeking submersible vessels to accessorize their latest superyacht purchase, The Washington Post reports.