Paired half of a famous line from Mao Zedong's 1965 poem 《
水调歌头·
重上井冈山》:
可上九天揽月,
可下五洋捉鳖,
谈笑凯歌还 — 'We may climb the ninth heaven to pluck the moon, or descend the five seas to catch the giant turtle; laughing and singing, we return in triumph.' Now standard rhetoric for China's deep-sea exploration program.