I dont understand the big fuss ?
The only problem I see is that you didn't have a guide line leading you back to the Hole. in case of a silt out.
The simple solution is to follow Cave rules. Cut a hole above a known point (directly above the plane tail wing) go down, run a spool or a line to the wreck, explore the wreck, take the line back... if you silt out, or lose your mask, you follow the line back to the end, once you reach the end, you know you are at the tail of the plane! so you come straight up and out the hole. the tail wing of the plane is technically a Cavern environment because once you get to the end of the line you have direct access to the surface.
There is no current. I would not attempt this in a high current environment or where you have never been before
Of course to be following cave rules you should have a redundant air source, and diving 6ths with a bigger tank......
disclaimer I have not taken a cave course but I've been reading and researching and talking to cave divers for the past year