450 million years. but have only experienced large urban areas for a few hundred years. scientists at the university of miami wanted to find out if sharks are attracted to or repelled by big cities. what we were trying to do is track the sharks to see if they would be avoiding areas really close to the city that were polluted, lots of boat traffic, lots of, you know, human disturbance. and we really thought they would. reporter: using acoustic technology, researchers monitored the movements of bull sharks, nurse sharks and great hammerhead sharks off the coast of miami for several years. essentially what we did is we placed these transmitters, small tags on the sharks, about the size of a aa battery, and they would emit an ultrasonic sound. reporter: the sound included a code that identifies each shark. they then placed listening
The underwater autonomous receiver uploads tracking data from tagged salmon to the cloud in near real-time to help hydroelectric plant operators know wh.
u.k.-based blue jay mining to find metals that power evs. it s changing the game for the sought after metals. you can see it opens more windows. we have longer periods where we are able to transport metals from greenland. reporter: a camp of 30 geologists, geo physicists, cooks, pilots and mechanics are on site. cnn is the first media outlet to get footage of what s happening there. they re taking soil samples, flying helicopters with transmitters to measure the electromagnetic field of the subsurface and map the rock below. they re analyzing the data to determine exactly where to drill next summer. while the vanishing ice offers
exploration company partnered with uk-based blue jay mining to find metals that power renewables and ev s. they say greenland s climate change induced icemelt is changing the game for sourcing be sought after metals. you can see the windows from sea ice, we have longer periods where we are able to transport the metal from greenland to the global market. a cap of 30 geologist, geophysicist, pilots and mechanics are on-site and cnn is the first media outlet to get video of the activity happening there. they are taking soils, flying helicopters with transmitters, to measure the electromagnetic field of the subsurface, and map the layers of rock below,