WASHINGTON (AP) — The Trump administration put up $750,000 to charter a private yacht to evacuate a single American citizen from a remote South Pacific island after she had been aboard a cruise ship at the center of a deadly hantavirus outbreak, a move that has further strained the State Department’s emergency budget.

The woman, who may have been exposed to the virus while aboard the Dutch MV Hondius cruise liner in April, had gotten off the ship and then flown to San Francisco before traveling to the isolated British territory of Pitcairn Island through Tahiti, according to two U.S. officials and an internal government document obtained by The Associated Press.

The exact amount of the total evacuation payment is still being assessed because the operation is still underway. Both officials spoke on condition of anonymity to discuss a medical case covered by U.S. privacy laws.

The costly effort to pick up the woman has added to the expense of rapid evacuations for diplomats and private U.S. citizens from the Middle East since the start of the Iran war as well as preparations for possible evacuations from Ebola-stricken countries. All have stressed the State Department budget for unforeseen emergencies, known as the “K Fund,” and brought its balance to the lowest level in seven years.

State Department emergency budget strained by multiple evacuations

Another internal document said the State Department is looking at transferring as much as $50 million into that emergency fund from other accounts — $35 million from the budget for embassy security, construction and maintenance and an additional $15 million from an account that pays for broader diplomatic programming. No decision on the transfers has yet been made.

One of the officials said the State Department has another option, to ask Congress to replenish the fund. However, the official said the department is expected to be able to handle payments for both ongoing and “emerging contingency needs.”

The official would not say what the potential shortfall is but insisted that the department is “well positioned” to support diplomats, other U.S. government employees and private Americans who have been forced to leave the Middle East because of the Iran confict, as well as U.S. citizens who may need assistance due to developments such as the Ebola outbreak in Africa.

How the US is evacuating an American exposed to hantavirus from a remote island

The State Department declined to comment on the specifics of the woman’s case on Pitcairn Island but said that “when an American is at risk abroad and unable to access commercial transportation, the Department of State seeks to provide appropriate assistance to get them home to the United States or to another safe location.”

After the woman departed the cruise liner where the hantavirus outbreak occurred, the ship continued to other destinations in the South Atlantic, with some passengers falling ill and at least three dying. The unidentified American woman was stuck on Pitcairn, an island with only about 50 inhabitants, no airport and infrequent maritime options to depart.

Pitcairn is well-known as the island on which Fletcher Christian and other British mutineers from the HMS Bounty took refuge after the 1789 events that toppled Capt. William Bligh, which have entered into the public lexicon with books and films about the “Mutiny on the Bounty.” Their descendants make up most of the island’s current population.

Complicating matters, British authorities had sought urgent American assistance in evacuating the woman from the island, which is their territory, according to the government document about the cost of the evacuation and the second U.S. official.

But initial attempts to send her to Tahiti, a French dependency, about 1,350 miles (2,160 kilometers) — or a 30-hour sea journey — from Pitcairn, were rejected by French Polynesian authorities. They did not want to allow her in because she had not disclosed her exposure when she transited the island on her way to Pitcairn.

The U.S. is transporting the woman, who was not symptomatic, from Pitcairn to Easter Island, another remote location in the Pacific about 1,400 miles (2,253 km) away, which is a territory of Chile and has direct flights to Santiago, so she can return to the United States for any necessary treatment.

All of those factors mean the process of getting her moved from Pitcairn to Easter Island took many weeks to arrange, the officials said.

The government document, which was confirmed as accurate by the two officials, said moving the woman from Pitcairn eventually was arranged via the “Titaina Explorer” trimaran yacht owned by a wealthy Frenchman, who uses it for personal exploration in the South Pacific. Pitcairn has no airport and only limited sea access.

The officials said the woman had no political or celebrity connections and they did not know exactly when she will return to the U.S. Maritime tracking sites show that the Titaina Explorer departed Pitcairn Island on June 5. The voyage to Easter Island can take up to 10 days depending on the speed of the boat and the weather.