An unmanned Space Exploration Technologies mission blasted off on Saturday carrying cargo for the International Space Station, but efforts to reland the rocket on a sea platform failed, the firm said. The Dragon cargo capsule itself was successfully launched into space and is expected to dock with the space station on Monday. Seeking to cut the cost of space launches, SpaceX hoped to bring the rocket back to Earth, aiming to land it on a floating platform in the Atlantic Ocean some 200 miles (322 km) off Jacksonville, Fla., north of the Cape Canaveral Air Force Station launch site. A ship stationed near the platform tried to capture the touchdown on video, but it was too dark and foggy, Musk said. Engineers will look to work out what went wrong by studying data relayed during the descent, as well as pieces of the rocket itself, he added. “Ship itself is fine. Some of the support equipment on the deck will need to be replaced,” said Musk, who prior to the launch had put the odds of a successful touchdown on the first attempt at just 50 percent.