Colonel Jacob E. Smart planned the operation, based on HALPRO's experiences. HALPRO had encountered minimal air defenses in its raid, so the planners decided Tidal Wave would be executed by day, and that the attacking bombers would approach at low altitude to avoid detection by German radar. Training included extensive review of detailed sand table models, practice raids over a mock-up of the target in the Libyan desert and practical exercises over a number of secondary targets in July to prove the viability of such a low-level strike. The bombers to be used were re-equipped with bomb-bay fuel tanks to increase their fuel capacity to 3,100 gallons.