Atletico Madrid coach Diego Simeone, with tears welling in his eyes, watched as Los Colchoneros fans erupted in celebration at the Wanda Metropolitano Stadium.
Just moments earlier, he paced nervously on the sidelines, unable to witness the tense penalty shootout that secured Atletico's triumph over Inter Milan and propelled them to the Champions League quarterfinals.
Led by Jan Oblak's crucial saves and a late regulation winner, Atletico prevailed 3-2 on penalties.
"It was moving," Simeone said. "I'm happy for the players and for the fans. Again, we are among the best eight teams in Europe. That says a lot about this club."
Oblak saved the penalties by Alexis Sanchez and Davy Klaassen before Martinez missed the final kick for last year's European runner-up.
"In the end, it is a bit about luck in the shootout," Oblak said. "Because you have to choose the correct side and you have to make the stop. If the player takes the kick perfectly, it's impossible to stop it. Thankfully, I was able to make the saves. What matters is the victory and that we made it to the quarterfinals."
Memphis Depay, Rodrigo Riquelme, and Angel Correa converted their penalties for Atletico, with Saul Niguez having his shot saved by Inter goalkeeper Yann Sommer. Hakan Çalhanoğlu and Francesco Acerbi scored for the visitors in the shootout.
Atletico reversed the 1-0 first-leg loss after Depay scored an 87th-minute goal that gave Simeone's team a 2-1 win in regulation.
Atletico didn't make it past the group stage last season and was eliminated by Manchester City in the last eight in 2021-22.
Inter, which lost last year's final to Man City, arrived at the Metropolitano Stadium enjoying a 13-game winning streak. It hadn't lost in 15 consecutive games in all competitions and had won all its matches in 2024.
"We must be proud of what we did in this Champions League," Inter coach Simone Inzaghi said. "In the second half, we should have done better. In extra time, we had more energy, but unfortunately, we made too many mistakes."
Inter opened the scoring in regulation with Federico Dimarco in the 33rd minute, but Atletico equalized two minutes later with Antoine Griezmann in his return from injury.
In the other Champions League match Wednesday, Borussia Dortmund defeated PSV Eindhoven 2-0 at home to advance 3-1 on aggregate.
The eight teams in the quarterfinal draw are Atletico, Dortmund, Bayern Munich, Paris Saint-Germain, Real Madrid, Manchester City, Arsenal and Barcelona.
It was an open match at the Metropolitano Stadium, with Atletico pressing forward from the start and Inter threatening on counterattacks.
The hosts dominated the final part of the match and created several chances until Depay broke through with the late winner, a low shot from inside the area after a nice set-up by midfielder Koke Resurreccion.
Inter had increased its first-leg lead, with Dimarco scoring with a low shot from the middle of the area after a pass by Nicolo Barella following a breakaway in the 33rd minute.
But it didn't take long for Atletico to answer, equalizing a couple of minutes later with Griezmann scoring after picking up a loose ball inside the area.
Griezmann was making his return to action after spraining his ankle in the first leg in Italy three weeks ago. The France forward has been key for Atletico this season but hasn't scored in eight consecutive matches in all competitions.
Barella had a chance to add Inter's second goal in a breakaway in the 82nd minute, but he got off a weak shot in a one-on-one situation with Oblak. Depay had hit the post in the 85th minute, a few minutes after coming off the bench to replace Alvaro Morata.
Riquelme came close to sealing Atletico's triumph in the third minute of stoppage time in regulation, but his shot from near the penalty spot missed over the crossbar. Simeone dropped to the ground after the ball sailed over the net.
Atletico arrived with a great home record but had won only two of its last nine matches in all competitions.
The Champions League represents Atletico's last realistic chance for a title this season. It was eliminated in the semifinals of the Copa del Rey and sat in fourth place in the Spanish league, 14 points behind leader Real Madrid.