This picture made available by the Italian Fire Brigades on Tuesday, April 9, 2024, shows the rescue operations inside the Enel Green Power hydroelectric plant of the Suviana Dam, some 70 kilometers southwest of Bologna, northern Italy on Tuesday, April 9, 2024. Search and rescue operations were still underway on Wednesday, April 10, 2024, at a decades-old hydroelectric plant after a devastating blast a day before killed at least three workers, injured five, and left four missing. (Italian Fire Brigades via AP, HO)
Fire fighters work at the scene of an explosion that occurred at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometres southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
Italian Carabinieri, paramilitary police patrol at the scene of an explosion that occurred at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
Fire fighters work at the scene of an explosion that occurred at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometres southwest of Bologna, Italy, Wednesday, April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
Police patrol at the scene of an explosion that occurred at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
Emergency personnel work at the scene of an explosion that occurred at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
Fire fighters work at the scene of an explosion that occurred at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometres southwest of Bologna, Italy, Wednesday, April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
Emergency personnel work at the scene of an explosion occurred at the hydroelectric plant at the Suviana Dam, Italy, Tuesday, April 9, 2024. Italian media are reporting that an explosion at a hydroelectric plant Tuesday in the Apennine Mountains south of Bologna has left at least three people dead and another six reported missing. The explosion occurred at the hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna. (Michele Nucci/LaPresse via AP)
Italian Carabinieri, paramilitary police patrol at the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
A view of the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
A view of the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)
This picture made available by the Italian Fire Brigades on Tuesday, April 9, 2024, shows the rescue operations inside the Enel Green Power hydroelectric plant of the Suviana Dam, some 70 kilometers southwest of Bologna, northern Italy on Tuesday, April 9, 2024. Search and rescue operations were still underway on Wednesday, April 10, 2024, at a decades-old hydroelectric plant after a devastating blast a day before killed at least three workers, injured five, and left four missing. (Italian Fire Brigades via AP, HO)
A view of the Enel Green Power hydroelectric plant at the Suviana Dam, some 70 kilometers southwest of Bologna, Italy, Wednesday , April 10, 2024. Search and rescue operations were still under way on Wednesday morning at a decades-old hydroelectric plant close to the northern Italian city of Bologna, after a devastating blast a day before killed at least three workers, injured five, and left four missing. Wednesday, April 10, 2024. (AP Photo/Antonio Calanni)