question for socrates/ philosophers of science

i have a theory "process x" once happened. "process x" has never been seen/observed (no eye witness testimony, therefore no men or anyone with instruments to document/record it) and this "x" is alleged to have both started and stopped happening with no eyewitness/no eyes to see/nor instruments to observe/record it.

hypothesis is "x" happened.

how do i "test" his theory/hypothesis? ( i assume Science goes hypothesis-test-more testing/repeating/conclusions/predictions)? Tweet