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U.S. Navy officials are weighing options for boosting the size of their fleet, which appears increasingly inadequate to handle growing maritime threats from China, Iran and Russia.

The Navy has 276 vessels, but while up to 100 are deployed globally, many are dry-docked for months — or even years —waiting for maintenance, upgrades or certifications. With China, Iran and Russia expanding their navies and taking more aggressive actions on the high seas, there is an urgent need for America’s currently idle ships and submarines to head out to the open sea.

“Our advantage is shrinking,” Adm. John Richardson, chief of Naval Operations, said. “We must reverse this trend.”

There are at least five possibilities of reversing America’s shrinking advantage: Recommission mothballed vessels; extend the service life of currently operating vessels; speed scheduled dock work; build new ones and operate the existing fleet more efficiently.

The option of bringing back retired vessels has its critics.

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141004-N-TW634-734 INDIAN OCEAN (Oct. 4, 2014) The Oliver Hazard Perry-class guided-missile frigate USS Rodney M. Davis (FFG 60) departs from a replenishment-at-sea with the Military Sealift Command fleet replenishment oiler USNS Tippecanoe (T-AO 199). Rodney M. Davis is on patrol in the Indian Ocean in support of regional security and stability. (U.S. Navy photo by Mass Communication Specialist 3rd Class Derek A. Harkins/Released)

“The Navy has to consider what it would cost to bring each of these ships back into service, what would need to be invested so they would be capable against today’s threat, and how many more years could we get out of these ships,” said Tom Callender, senior fellow for Naval Warfare and Advanced Technologies at the Heritage Foundation. “We would spend many years and hundreds of millions of dollars to bring them back. We have to find room in the shipyards to do this work, we have to plan it out, and we have to find the money and realize it will be several years in the process.”

Lt. Kara Yingling, a Navy spokesperson, said the Navy is exploring every option to increase the capacity and capability of the battle force, including extending the expected service life of ships and reactivation.

“Reactivating retired ships will be a challenge because the ships are old and have not been maintained and modernized since deactivation,” Yingling said. “A lot has changed since we last modernized those ships, and there could be significant costs involved with restoring their systems.”

A more strategic plan, Callender said, is to speed up maintenance, repair and certification. Part of the problem is a severe worker shortage of about 2,000 people.

“Backlog in repairs has been a major issue in the last several years as the Navy has seen their operations and maintenance budget cut with continuing sequestrations,” Callender said. “In 2016, about halfway through the year the Navy was in the hole about $848 million, and that caused them to delay five ships' availabilities.”

The USS Albany, for example, spent over four years in the shipyard due to continued delays, so while the attack submarine is on the registry, it wasn’t being used.

Our advantage is shrinking. We must reverse this trend.

— Adm. John Richardson, chief of U.S. naval operations

Richardson outlined a plan in May for more quickly designing, building and launching a larger and more powerful fleet that incorporates cutting-edge technologies and new operational concepts.

“The current security environment is faster paced, more complex, and increasingly competitive,” Richardson wrote in the 2016 Force Structure Assessment, to back the plan. “Time is an unforgiving characteristic of that environment —things are moving faster, including our competitors.”

The Navy is proposing a 355-ship fleet with 12 carriers, 104 large surface combatants, 52 small surface combatants, 38 amphibious ships and 66 submarines over the next 30 years.

Yingling said that in fiscal year 2017, the Navy currently expects to deliver 13 ships and retire 6 ships, and by fiscal year 2022, is scheduled to raise the size of the battle force from the current 276 ships to 310 ships.

Part of the Navy’s strategy will be to better coordinate its fleet, Richardson said.