Dr. No ending explained (spoilers)

[afycumi]

Bond escapes from Dr. No's prison and crawls undetected through the ventilation shafts to the main control room, where Dr. No is about to topple a new US missile. Bond thwarts the plan by overloading the nuclear reactor that powers the base; he kills Dr. No by lowering him into the overloading reactor. Honey finds him and they escape in a small boat as Dr. No's base explodes. They are later picked up by Felix Leiter and the US Marines.