NOVA Season 30 Episode 15 Synopsis

In 1989 marine biologist Alexandre Meinesz went diving off southern France and was stunned by what he saw: a dense blanket of waving green fronds stretching around him in every direction on the seabed. At first Meinesz had no idea what it was. Then he made the alarming discovery that a tropical alga had taken root in the cold water of the Mediterranean, wiping out native sea life wherever it grew. "Deep Sea Invasion" follows Meinesz on his scientific detective hunt to discover the source of this deadly organism, his uphill battle to alert authorities to its danger, and the struggle to find a non-toxic way to control it.

NOVA Season 30 Episodes...

• s30e01 - Killer Disease On Campus
• s30e02 - Mysterious Life Of Caves
• s30e03 - Lost Roman Treasure
• s30e04 - Galileo's Battle For The Heavens
• s30e05 - Volcano's Deadly Warning
• s30e06 - Sinking City Of Venice
• s30e07 - The Orchid Hunter
• s30e08 - Spies That Fly
• s30e09 - Last Flight Of Bomber 31
• s30e10 - Ancient Creature Of The Deep
• s30e11 - Battle Of The X-Planes
• s30e12 - Mountain Of Ice
• s30e13 - Lost Treasures Of Tibet
• s30e14 - Dirty Bomb
• s30e15 - Deep Sea Invasion
• s30e16 - Secret Of Photo 51

NOVA Show Summary

Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.