Maybe the 'A WHALE' sucked it all up during that one test.
The WHALE did not work cause the Corexit broke down the oil into droplets and now it can not be cleaned up. That oil is right there; we just can’t see it in globs. Also, according to NOAA, it is thick a few feet below eye level and deep and wide. An unseen lake they call it. Lucky us. It will emerge.