hydrogen sulphide

this is why those creatures are dying. it is produced by creatures that thrive in an oxygen free anoxic environment.

[link to www.sciencedirect.com]

along with the huge methane release in the gulf, we are seeing EXACTLY what happened in the permian extinction event happen right before our eyes.

[link to www.killerinourmidst.com]

and some think it's just 'shells on a beach'