Unless you are a experienced cave diver, Use to closed in spaces. I would not advise going inside. Ship wreaks are VERY dangerous. Very easy to get trapped and such.
As for which one, the most shallow one would be the best. The deeper it is the less time you will have at the wreak site. At 60 feet you have 60 minutes before you would need to decompress. the deeper you go the time decreases.
Have fun but be careful.
