That night Brains makes a second dive into the Lake, discovering treasure stored in one of the Temple's pillars. He trips over an alarm set by the Hood and following a series of wires along the lake bed, soon runs into The Hood, who hypnotizes him once again.
The Hood blows up the temple to try and reveal the hidden treasure, but traps Brains beneath one of the columns in the process. Thunderbird 4 is sent down to rescue Brains.
Thunderbird 4 is launched into the lake from Thunderbird 2, and Gordon finds the temple in ruins. He soon locates Brains, whose air is running out, but is fired upon by the Hood's submarine. Gordon pursues the Hood, scoring a direct hit with his missiles and destroying the submarine, but the Hood manages to escape before the submarine explodes.
Brains is trapped beneath a column, but Scott brings down a Hydrostatic Hoist which he and Gordon are able to lift the column Gordon pulls Brains clear just as the cords on the hoist snaps and the column crashes back on to the lake bed.