Download 4K
Download 4K
Download 4KSeason
Season 23 Episode
- Season 1 Jane Goodall
- Season 1 Shark Behavior
- Season 1 Virtual Universe
- Season 1 Polar People
- Season 1 Voyager
- Season 1 Wings Of Wonder
- Season 1 Sun's Lost Siblings
- Season 1 Super Solar Cells
- Season 1 Our Chemical Lives
- Season 1 Antivenom
- Season 1 Powering The Mind
- Season 1 Alien Technology
- Season 1 3D Virus
- Season 1 Future Cities
- Season 1 Quantum Computing
- Season 1 Peacock Spider
- Season 1 Allergy Pill
- Season 1 Cardiac Implants
- Season 1 Honey Bees
- Season 1 Extreme Weather
- Season 1 Fast Food For Hummingbirds
- Season 1 Ancient Writing
- Season 1 Tokyo Flood Prevention
- Season 1 Life Enhancing Drugs
- Season 1 Bioluminescence
- Season 1 Mega-tsunamis
Catalyst - Season 1 Episode 23 Tokyo Flood Prevention
0.00 30 minutes Fifty meters beneath the teeming mega-city of Tokyo is an underworld river system - 6.4km of tunnels, colossal water tanks, massive pillars, giant pumps that remove 200 tons of floodwater every second. It’s an engineering marvel built to protect Tokyo against the increasing threat of flooding.
