The PADI Wreck Diver Specialty has the option of 1 penetration dive. Regardless of whether or not this option is used, this class is not an overhead class and you are not trained or able to safely penetrate a wreck or any other overhead environment. The NAUI counterpart to this course is called External Wreck Survey (or something like that) and is a much better way to think of this course. If taught properly, it gives students the tools and skills to safely dive ON and AROUND a wreck. Many of my students say they really had no idea how much there is to know and how happy they were to have taken the class. Some move on to the more advanced
Wreck Penetration Distinctive Specialty Course, which is a minimum of 2 open water dives and 4 wreck penetration dives.