History
Espumar was a Mexican drug lord who was smuggling drugs into the United States across the southwestern border. The DEA could not figure out how he was bringing it in, so S.H.I.E.L.D. got involved. Espumar had built a great tunnel that ran from his mansion to his warehouse in New Mexico. It was a tunnel that was at 50-100 ft tall and wide, large enough for at least three convoys of trucks to pass through it side by side.
The tunnel was discovered by Nick Fury and Mexican government agent Antonio Gobier, who rolled in guns blazing. The S.H.I.E.L.D. Helicarrier then broke through the dirt and rocks above the tunnel via the use of excavators, and SHIELD personnel charged into battle. Nick Fury and the troops pulled out, and left a large bomb. Which took out the tunnel, the blast reaching all the way to Espumar's mansion.[1]