WASHINGTON (AP) — The chief executive of the massive fuel pipeline hit by ransomware last month told senators on Tuesday that authorizing a multi-million-dollar payment to hackers was the right thing to do to bring an end to fuel shortages affecting much of the eastern United States, even as authorities have discouraged such payments.

Asked how much worse it would have been if Colonial Pipeline hadn’t paid to get its data back, CEO Joseph Blount said, “That’s an unknown we probably don’t want to know. And it’s an unknown we probably don’t want to play out in a public forum.”

He said that given the company’s crucial role in fuel transport, and the potential for “pandemonium” arising from a prolonged shutdown of the pipeline, he made the decision to pay a ransom to the hackers. The encryption tool the hackers provided the company in exchange for the payment helped “to some degree” but has not been perfect, with Colonial still in the process of fully restoring its system, Blount said.

Blount faced the Senate Homeland Security Committee, one day after the Justice Department revealed it had recovered the majority of the $4.4 million ransom payment the company made in hopes of getting its system back online.

Blount’s testimony marks his first appearance before Congress since the May 7 ransomware attack that led Georgia-based Colonial Pipeline, which supplies roughly half the fuel consumed on the East Coast, to temporarily halt operations. The attack has been attributed to a Russia-based gang of cybercriminals using the DarkSide ransomware variant, one of more than 100 variants the FBI is currently investigating.

The company began negotiating with the hackers on the evening of the attack and, the following day, paid a ransom of 75 bitcoin — then valued at roughly $4.4 million. Though the FBI has historically discouraged ransomware payments for fear of encouraging cyberattacks, Colonial officials have said they saw the transaction as necessary to resume the vital fuel transport business as rapidly as possible.

“It was one of the toughest decisions I have had to make in my life,” Blount said in prepared remarks. “At the time, I kept this information close hold because we were concerned about operational security and minimizing publicity for the threat actor. But I believe that restoring critical infrastructure as quickly as possible, in this situation, was the right thing to do for the country.”

The attack, which Blount says began after hackers exploited a virtual private network that was not intended to be in use and has since been shut down, had significant collateral consequences, including gas shortages as concerned motorists rushed to fill their tanks.

The operation to seize cryptocurrency paid to the Russia-based hacker group is the first of its kind to be undertaken by a specialized ransomware task force created by the Biden administration Justice Department. It reflects a rare victory in the fight against ransomware as U.S. officials scramble to confront a rapidly accelerating threat targeting critical industries around the world.

“By going after the entire ecosystem that fuels ransomware and digital extortion attacks — including criminal proceeds in the form of digital currency — we will continue to use all of our resources to increase the cost and consequences of ransomware and other cyber-based attacks,” Deputy Attorney General Lisa Monaco said at a news conference announcing the operation.

In a statement Monday, Blount said he was grateful for the FBI’s efforts and said holding hackers accountable and disrupting their activities “is the best way to deter and defend against future attacks of this nature.

“The private sector also has an equally important role to play and we must continue to take cyber threats seriously and invest accordingly to harden our defenses,” he added.

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Cryptocurrency is favored by cybercriminals because it enables direct online payments regardless of geographical location, but in this case, the FBI was able to identify a virtual currency wallet used by the hackers and recovered the proceeds from there, Abbate said. The Justice Department did not provide details about how the FBI had obtained a “key” for the specific bitcoin address, but said law enforcement had been able to track multiple transfers of the cryptocurrency.

“For financially motivated cyber criminals, especially those presumably located overseas, cutting off access to revenue is one of the most impactful consequences we can impose,” Abbate said.

The Bitcoin amount seized — 63.7, currently valued at $2.3 million after the price of Bitcoin tumbled— amounted to 85% of the total ransom paid, which is the exact amount that the cryptocurrency-tracking firm Elliptic says it believes was the take of the affiliate who carried out the attack. The ransomware software provider, DarkSide, would have gotten the other 15%.

“The extortionists will never see this money,” said Stephanie Hinds, the acting U.S. attorney for the Northern District of California, where a judge earlier Monday authorized the seizure warrant.

Ransomware attacks — in which hackers encrypt a victim organization’s data and demand a hefty sum for returning the information — have flourished across the globe. Last year was the costliest on record for such attacks. Hackers have targeted vital industries, as well as hospitals and police departments.

Weeks after the Colonial Pipeline attack, a ransomware attack attributed to REvil, a Russian-speaking gang that has made some of the largest ransomware demands on record in recent months, disrupted production at Brazil’s JBS SA, the world’s largest meat processing company.

The ransomware business has evolved into a highly compartmentalized racket, with labor divided among the provider of the software that locks data, ransom negotiators, hackers who break into targeted networks, hackers skilled at moving undetected through those systems and exfiltrating sensitive data — and even call centers in India employed to threaten people whose data was stolen to pressure for extortion payments.

Associated Press writer Frank Bajak in Boston contributed to this report.