You don't seem to understand how this works. Watergate didn't play out in a day.
Someone will testify to stay out of prison for decades, and all the dominos will fall into place
to put it in hard numbers:
January 1972: Watergate tap/burglary plan put into motion
May 1972: First burglary and tap placement
June 1972: second burglary to cover fixing their taps and the one they got caught for
June 1972: coverup begins
May 1973: congress begins investigation
July 1973: discovery of Nixon's tapes, both Congres and Spec Prosc. try to get them, Nixon refuses
October 1973: Nixon fires a bunch of people until he finds one that will fire the special prosecutor. Panic mode.
During this time the tapes are released slowly.
""He is humorless to the point of being inhumane. He is devious. He is vacillating. He is profane. He is willing to be led. He displays dismaying gaps in knowledge. He is suspicious of his staff. His loyalty is minimal." - Chicago Tribune review of the tapes.
July 1974: Supreme Court rules Nixon has no executive priviledge that allows him to block the tapes
"smoking gun" tape released
August 1974: Nixon resigns
Also fun fact, Nixon secretly testified in front of a grand jury. The tapes from that weren't released until 2011.