http://en.wikipedia.org/wiki/1961_Goldsboro_B-52_crash#Bomb_...

https://en.m.wikipedia.org/wiki/VX_(nerve_agent)#US_VX_stock...

Roughly 124 tons of VX gas sitting under 7,200 feet of water, at the bottom of the ocean, somewhere of the coast of Atlantic City, NJ, and other un-named sites off the coasts of New York and Florida.

those chemical don't seem to come in large quantities so they're very diluted, but even then, they somehow solidify and reach the shore...

http://link.springer.com/chapter/10.1007/978-1-4020-5528-7_1...