PEARL HARBOR, Hawaii — The leaders of Japan and the United States sought to remind the world that even the most bitter enemies can become allies, during a historic pilgrimage to the hallowed waters of Pearl Harbor.

Prime Minister Shinzo Abe did not apologize, but conceded Japan “must never repeat the horrors of war again.”

Seventy-five years after Japan’s surprise attack, Abe and President Barack Obama peered down Tuesday at the rusting wreckage of the USS Arizona, clearly visible in the tranquil, teal water. In a show of respect for the war dead, Obama and Abe dropped purple petals into the water and stood in silence.

More than 1,000 U.S. war dead remain entombed in the submerged ship, which Japan struck as part of the devastating attack that killed more than 2,300 Americans and sent America marching into World War II.

“As the prime minister of Japan, I offer my sincere and everlasting condolences to the souls of those who lost their lives here, as well as to the spirits of all the brave men and women whose lives were taken by a war that commenced in this very place,” Abe said later at nearby Joint Base Pearl Harbor-Hickam.