To prevent the Grijalva river from overflowing, during the construction of the Chicoasén dam, "el ratón" and some engineers die. Two archaeologists decipher antique signs on the walls of the Canyon and discover the source of danger.
| Actor | Role |
|---|---|
 Fernando LarrañagaNot listed | Not listed |
 Julio AldamaNot listed | Not listed |
 Narciso BusquetsNot listed | Not listed |
 Bruno ReyNot listed | Not listed |
 Elpidia CarrilloNot listed | Not listed |