Related Clues:

• Tale of heroism
• "This is __"
• Guinness entry
• Controversial 50's event
• ''This is only ___''
• "This is only __"
• ''This is only ___!''
• Heroic act
• Bikini trial
• ''Guinness World Records'' entry, e.g.
• ''This is only __''
• Bomb trial, in old headlines
• 'This is only ___ . . .'
• Bikini atoll event
• Explosive trial, briefly