You are looking at 45 surplus M117 750lb general purpose bombs being dropped out of the weapons bay of a B-52H Stratofortress in under two seconds. You can see the impacts seconds later on the island far below.

Last March I asked a B-52 pilot how accurate using the B-52's radar to deliver dumb bombs is in a day and age of precision guided munitions. The pilot's response:

"Freakishly accurate. If you need a building destroyed use a PGM (precision guided munition), if you need the sprawling industrial complexes around it gone too, a B-52 laden with dumb bombs is your guy."