The scoring in the match hosted by the Blandel Park stadium began with a goal scored by Charlo Verneam in favor of Grimsby in the 22nd minute.
The goal came after Vernam was perfectly concentrated inside the penalty area, and received a full -fledged ball for him, before he was strongly aimed at the Onana window.
Terrill Warren added the second goal for the hosts in the 30th minute, after he took advantage of a fatal mistake from Andre Unana, the United goalkeeper.
The Cameroonian alternative, Brian Mibuimo, succeeded in reducing the difference with a goal for United in the 75th minute, after receiving the ball on the side of the stadium and set out and fired with a strong shot that gave the goalkeeper.
English star Harry Maguire managed to score the UNED equalizer in the 89th minute after a distinctive header game.
The two teams failed to add the third goal at the remaining time, so the meeting went to the penalty shootout, and the marathon ended with a 12-11 victory.
United was lost by Matius Konya and Brian Mbumo (his second kick was lost after he had recorded his first kick).
The draw for the third round in the League Cup will be held shortly, and each team will know its competitor in the next round.
It is worth noting that Newcastle is the defending champion after winning it last season, and Liverpool maintains the top of the most historically crowned table of the tournament with 10 titles, the last of which was in the 2022/2023 season.