Zira and Cornelius assisted Brent and Nova to escape (and provided him with clothing ""fit for humans""), and advised: "Never to speak" if caught by the gorillas: "Only apes can speak.Although the film did poorly at the box-office when first released, its critical success and a number of re-releases eventually brought it financial returns..." Farrell hypothesized about the attack: "Jesus Christ, it""s a fire-sale..It""s a three-step systematic attack on the entire national infrastructure...everything must go" - the three components were transportation, the financial base and telecoms, and the utilities (gas, water, electric, nuclear).The astronomers shove themselves into the rocket""s interior - all except for the President, who is left behind - outside he shell.