Abernathy does cageless Tiger and Hammerhead encounters off of the Shearwater. Based on the schedule on their website they should be in the middle of one right now.
JASA: Bahamas Live-Aboard Rates and Availability
Have seen some of the footage from their trips on the Discovery Channel. Amazing stuff, but it does have some inherent risks. Will be interested in seeing the details. Hope the guy is ok.