ISLAMORADA, Fla. - Hurricane Irma evacuees from the Florida Keys began returning to the storm-ravaged island chain on Tuesday to find homes ripped apart and businesses coated in seaweed amid a debris-strewn landscape where an estimated 25 percent of all dwellings were destroyed.The death toll from Irma, previously ranked as one of the most powerful Atlantic storms on record and the second major hurricane to strike the US mainland this season, climbed to 43 in the Caribbean, with at least 13 more killed in Florida, Georgia and South Carolina.Some of those died from accidents during cleanup and repair efforts.Destruction was widespread in the Keys, a resort archipelago stretching southwest from the tip of the Florida Peninsula into the Gulf of Mexico and connected by a single, narrow highway and a series of bridges and causeways along a nearly 100-mile (160-km) route."I don't have a house. I don't have a job. I have nothing," said Mercedes Lopez, 50, whose family fled north from the Florida Keys town of Marathon last Friday and rode out the storm at an Orlando hotel, only to learn their home was destroyed, along with the gasoline station where he worked."We came here, leaving everything at home, and we go back to nothing," Lopez said. His and three other families from Marathon planned to venture back on Wednesday to salvage what they can.Initial damage assessments found 25 percent of homes in the Keys destroyed and 65 percent with major damage, according to Brock Long, administrator of the Federal Emergency Management Agency (FEMA)."Basically every house in the Keys was impacted," he told reporters.The islands were largely evacuated by the time Irma barreled ashore on Sunday as a Category 4 hurricane, packing sustained winds of up to 130 miles per hour (215 km per hour).Two days later authorities began allowing re-entry to the islands of Key Largo, Tavernier and Islamorada for residents and business owners only. The extent of the devastation took many by surprise."I expected some fence lines to be down and some debris," said Dr. Orlando Morejon, 51, a trauma surgeon from Miami as he hacked away at a tree blocking his Islamorada driveway. "We were not expecting to find someone else's sailboat in our backyard."The walls of nearby trailer homes were left ripped wide open, exposing insulation and the sodden interiors of bedrooms and kitchens to the elements.At the Caloosa Cove Resort and Marina, concrete pilings meant to hold the dock in place had been knocked sideways, and three manatees lolled in the water, drinking from an outflow pump spitting water from the dockside.Marilyn Ramos, 44, spent the morning cleaning sand and seaweed that had covered her Cuban restaurant Havanos when she arrived early Tuesday."I'm trying to stay calm and see how we can work through this," Ramos said. "It's devastating."A short distance away, the scent of decaying seaweed hung heavy in the air as Brooke Gilbert, 15, stood with her younger sister staring at the jumble of concrete and twisted metal left from the three-story condo that was their family's getaway home."There's the couch right there," she said. "I recognize the clothes in that closet. They belong to my grandmother."At the end of Islamorada, roughly the halfway point of the Keys, police at a checkpoint turned around returning residents seeking to travel farther south and waved through utility crews, law enforcement and healthcare workers.Authorities said they were barring re-entry to the remainder of the Keys to allow more time to restore electricity, water, fuel supplies and medical service. US officials have said some 10,000 residents of the Keys stayed put when the storm hit and may ultimately need to be evacuated.