1 Shawn Michaels Was the Winner of The Very First Chamber Match
2 Edge is the Only Superstar to Compete in Two Elimination Chamber Matches on The Same Night
Edge Lost the WWE title in the first Match and Won The World Heavyweight
3 Chris Jericho Has Appeared In More Elimination Chamber Match's Then Anyone Else
A total of 8 appearances by Jericho, 2002, 2003, 2005, 2008, 2009, 2010, 2011 & 2012 only winning Once.
4 Triple H is The First Champion To Successfully Retain a Title Inside The Chamber
Summer Slam 2003 Triple H retains the World Heavyweight Title with help from Ric Flair by using a sledgehammer on Goldberg for the win.
5 Rob Van Dam Was The Very First Superstar Eliminated From The Chamber Match
RVD got eliminated following a miscalculated frog splash off the pod which ended up crushing Triple H's throat sending him to the hospital after the match.
6 Every Time John Cena Retains or Wins a Title After The Chamber Match He Loses it Minutes Later
New Years revolution 2006 Cena retains the WWE Championship then loses it to Edge after cashing in the Money in the Bank contract, The 2nd was in Elimination Chamber 2010 Cena Wins The WWE Championship then loses it to Batista.
7 No Way Out 2008 Was The First Pay Per View That Featured Two Elimination Chamber Matches on the Same Night
8 2004 & 2007 Were The Only Years That Didn't Feature an Elimination Chamber Match
9 Chris Jericho Was The First Superstar To Be Eliminated From The Match Without Actually Getting Beat inside The Chamber
10 The ECW December To Dismember Elimination Chamber Match Was The Only Time The ECW Championship Was Defended
You worded that like that was the only match in history in which the ECW title was at stake.
Ii was also the only chamber match that featured weapons.
The Contenders
11 Braun Strowman Eliminated the most competitors in 1 match
12 Kane was the first man to ever smash someone through a pod