In the cabins they found personal belongings: letters, old photos, books in various languages. Everything indicated that the submarine had been in active use, possibly in the mid-20th century.

However, the hull’s serial number and certain technical details did not match any known model.

Then they found documents. Many had been damaged by time, but what could be salvaged stunned even the most skeptical scientists.

They described a mission to monitor experimental nuclear facilities in the Persian Gulf. The date — 1968.

Country of origin — not indicated. Names — encrypted. Only one fragment remained clearly legible:
“Contact established. Device activated. Time window opened for 36 seconds.”