[['explosion', 'location', 'date', 'yield (approximate)', 'altitude (km)', 'nation of origin'], ['hardtack teak', 'johnston island ( pacific )', '1958 - 08 - 01', '3.8 megatons', '76.8', 'united states'], ['hardtack orange', 'johnston island ( pacific )', '1958 - 08 - 12', '3.8 megatons', '43', 'united states'], ['argus i', 'south atlantic', '1958 - 08 - 27', '1 - 2 kilotons', '200', 'united states'], ['argus ii', 'south atlantic', '1958 - 08 - 30', '1 - 2 kilotons', '256', 'united states'], ['argus iii', 'south atlantic', '1958 - 09 - 06', '1 - 2 kilotons', '539', 'united states'], ['starfish prime', 'johnston island ( pacific )', '1962 - 07 - 09', '1.4 megatons', '400', 'united states'], ['k - 3', 'kazakhstan', '1962 - 10 - 22', '300 s kiloton', '290', 'ussr'], ['k - 4', 'kazakhstan', '1962 - 10 - 28', '300 s kiloton', '150', 'ussr']]
Argus Iii had the highest Altitude
[ENT] had the highest [ENT]