Danger Island

Episode 13 (1x13)

:

When the earthquake subsides, Morgan, Chongo, Link and Leslie try to rescue Dr. Hayden, who is trapped in the cave under tons of earth and rock. Chongo discovers an opening in the cave which leads to where Dr. Hayden is. They rescue him and recover the map. They then build a makeshift boat so they can find the inlet where they believe the boat is.