SAIPAN, Northern Mariana Islands (AP) — Searchers found the body of one of the six missing crew members from a cargo ship that overturned near the Northern Mariana Islands during a typhoon and were looking for the rest, hoping they might have made it to a life raft.

U.S. Air Force divers used an underwater drone on Tuesday to search inside the overturned ship, the U.S. Coast Guard said in a news release. Divers from Japan's coast guard further examined the ship, called the Mariana, but didn't find the other five, it said.

READ MORE: Coast Guard searches for 6 after losing contact with boat disabled by Typhoon Sinlaku

"Coast Guard aircrews continue to search for the five missing crewmen and an orange 12-person life raft in the vicinity of the Commonwealth of the Northern Mariana Islands," the news release said.

The National Weather Service said Super Typhoon Sinlaku, the strongest tropical cyclone this year, was packing sustained winds of up to 150 mph (241 kph) when it made landfall last week in the Northern Mariana Islands, which, like Guam to the south, are a U.S. territory.

The Coast Guard and agencies from Guam, Japan and New Zealand have covered more than 99,000 square miles (256,000 square kilometers) in their search for the crew, the guard said this week. That's an area roughly the size of Oregon.

The ship notified the U.S. Coast Guard on April 15 that the U.S.-registered vessel lost its starboard engine during the typhoon and needed assistance. The guard said it lost contact with the ship the next day.

"Our hearts are with the families of the Mariana crew members and the communities impacted by this tragic incident," Cmdr. Preston Hieb, the search and rescue mission coordinator for the Coast Guard Oceania District, said in the statement.

Heavy wind hindered initial search efforts, but the overturned ship was eventually spotted Saturday about 40 miles (64 kilometers) northeast of Pagan, one of the Northern Mariana Islands.

The Coast Guard said Monday that debris including a partially submerged inflatable life raft was spotted about 110 miles (177 kilometers) from the ship.

While specific safety requirements for the 145-foot (44-meter) ship were not known, federal and international codes call for cargo ships to have life rafts stocked with food and water. The rafts have to be able to withstand exposure for 30 days, according to a code put out by the International Maritime Organization.

Aaron Davenport, a retired Coast Guard officer with search and rescue experience who isn't involved in the current operation, said it would have been very difficult to deploy a raft during the typhoon.

"If they didn't hook it somewhere and they just deployed it into the water, it would probably blow away," he said.

Davenport wondered if searchers spotted any more safety equipment aboard the overturned ship.

"That would determine how long they need to search. Because if they have safety gear, if they're in another life raft or if they're in a survival suit or if they even have a life jacket — that tells me that they're going to survive longer, probably," he said.

Davenport also questioned whether the partially submerged raft that was found came from the Mariana.

"So if there's another ship that was affected by the weather there, they could have a life raft get washed off the top," Davenport said.

Sinlaku battered the Northern Mariana Islands, causing wind damage and flooding. Island ports reopened to commercial traffic this week, and the Coast Guard delivered pallets of water and supplies to areas that had been cut off.