Scientists exploring the deep waters off the African archipelago of Comoros captured rare footage of sharks thriving as far deep as 2,700 feet, a strong sign that a functioning food web still survives beneath the warming waters of the Indian Ocean. Their findings, paired with unexpectedly healthy coral reefs in the region, suggest hidden resilience in a part of the world grappling with the effects of climate change, overfishing and the urgent need for stronger marine protections.