Bali Hai is calling...follow me, follow me.
Nuclear wastes are chemical substances which will remain violently toxic virtually indefinitely.
Stable geological formations deep below ground and totally isolated from ground water are the only place where they can be safely stored.
Oceanic islands are vulnerable to storms, erosion, sea level change, accidental rediscovery in the distant future, attack by terrorists, and corrosive salt water. No container we can build today is so sturdy it can guarantee these materials will not be released into the currents of the world ocean long before their radioactivity is spent.
Nope. Salt mines is the best way to go. That's why they were picked in the first place. Too bad about Yucca Flats.