The options available for Black Jack wreck dive operators are rather limited, in fact really there are only two options available now as Rod Pearce who actually found the wreck back in December 1986 has now retired.
Tufi Dive Resort: It is a about a two hour trip across Collingwood Bay from Cape Nelson to Boga Boga and you need good weather to do it, but Tufi Dive does the Black Jack regularly on special request.
I dived Black Jack with Tufi Dive and both Glenn & Archie, the dive leaders at the resort, know the wreck well and how to dive it safely.
Golden Dawn: Craig de Wit on Golden Dawn includes Black Jack as part of the Milne Bay itinerary the boat does at certain times of the year. I first dove Black Jack from Golden Dawn back in about 2001 and Craig also knows the wreck well and how to dive it safely.