This episode's headline: Cave War; Presses Under Pressure; Hard Sell; Conversation. ANCHOR: JIM LEHRER; GUESTS: JACK SHRODER; ALI JALALI; FRANK ANDERSON; MICHAEL VICKERS; PETER COFFEE; ROB ENDERLE; BILLY COLLINS; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN