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That pipeline failure, which occurred under different ownership, spewed an estimated 140,000 gallons of crude oil, harmed hundreds of miles of coastline and cost millions to clean up.

These are essentially coastline buildings, in suburban areas.

Seagrass also cleans polluted water and protects coastlines from erosion.

Hurghada is a popular tourist destination, with its coastline known for its beaches and coral reefs.

Coast Guard Sector Humboldt Bay showed a helicopter flying along the steep coastline and, coordinating with rescuers on the ground, locating both hikers along the steep cliffside.