What happens when they attempt to blow up the boulder?

There is a big explosion followed molten lava being released. A giant Megalosaurus (a red tegu) attacks, but is completely covered by molten lava released by the explosion. The bowl floats atop the lava toward the passage and is driven upward at great speed, finally reaching the surface. Lindenbrook, Carla, and Hans are thrown into the sea, while Alec lands naked in a tree in a convent's orchard.