SAN DIEGO (Border Report) — Researchers from San Diego State University and UC San Diego are back in the Tijuana River Valley ...

SAN DIEGO (Border Report) — The County of San Diego is disputing findings by researchers who say they detected dangerous levels of hydrogen cyanide Monday morning in the Tijuana River Valley.

Mark Roth's pioneering work on hydrogen sulfide has spawned ... survived nearly an hour trapped underwater beneath ice flows after falling into a river while skiing. Triggered by the drop in ...

Narrator: There's a massive underwater sinkhole off the coast ... The culprit was a thick layer of toxic hydrogen sulfide spanning the width of the entire sinkhole like a floating blanket.