Hundreds of commercial tankers are stranded on both sides of the Strait of Hormuz after Iran shut the critical chokepoint on April 18, halting traffic and leaving crews trapped amid reports of gunfire and "traumatic experiences" on board.

The Strait of Hormuz is considered an international waterway under international law, through which ships have the right of transit passage, according to the United Nations Convention on the Law of the Sea (UNCLOS).

Roughly one-fifth of the world’s oil supply passes through the Strait of Hormuz, making it a critical chokepoint for global energy markets, according to the U.S. Energy Information Administration.

The port of Dubai, and all crews hope for an improvement in the situation," Haupt said.

The Islamic Revolutionary Guard Corps (IRGC) said on April 18 that the strait would remain closed until the U.S. lifts its blockade on Iranian ports, warning ships not to move from anchorage or risk being treated as "enemy" collaborators.

Iran has previously argued that restrictions on its oil exports and shipping amount to "economic warfare," framing actions in the Strait of Hormuz as a response to foreign pressure on its economy, according to statements from Iranian officials and state media in past incidents.

"Approaching the Strait of Hormuz will be considered cooperation with the enemy, and any violating vessel will be targeted," the IRGC said in a statement carried by the semi-official Tasnim News Agency.

The United States imposed the blockade on Iranian ports to pressure Tehran to reopen the strait, with U.S. Central Command saying the measures are being enforced "impartially against all vessels."

Hapag-Lloyd said its vessels have been stuck for weeks following the initial closure after the outbreak of war with Iran on Feb. 28.

"For us, it is critical that our vessels can pass through the strait soon," Haupt said.

"We offer all crew members unlimited data so they can video call loved ones and access entertainment. Crews are strong, but after weeks on board there is growing monotony and frustration."

"One crew experienced a fire on board from bomb fragments. Others have seen missiles or drones near their vessels," he added.

"They are resilient, but each additional day makes the situation more difficult, more monotonous, and more stressful."

President Donald Trump said Iran had agreed not to close the strait again but after the closure, Trump called the situation "blackmail" and said the U.S. would not back down.