You mean the ones that were loaded at King George V dock Glasgow? All 47 landed safely (by 1147). But, the Luftwaffe stepped up their actions against Malta as a result and 23 were lost by 30 April including several that were destroyed on the ground almost immediately after they landed.
Oh, these aircraft were stored in the Wasp's hanger and launching started at 0400 when Wasp put a CAP of 11 Wildcats in the air. This was followed by the Spitfires that had already started their engines and warmed up in the hanger. Each Spitfire was placed on the aft elevator, took an eight second ride to the flight deck and immediately launched. All 58 launches took 61 minutes to complete at 0501.
Wasp made a second, similar, trip on May 7 launching another 47 Spitfires in similar fashion. Of note this time was that one Spitfire lost its auxiliarly fuel tank on take off and managed to land without arresting gear back on the carrier!