What does “wreck certified” even mean? I don’t think there is a standard. If it’s a true overhead environment, where some unplanned contingency inside could get you into trouble, as opposed to something more like a swim-through, then it’s a tech-level dive and you should have redundant gear, the training to use it, a suitable dive plan, etc. You would have to really understand the wreck before the dive to decide whether it’s more like a swim-through or a tech dive. I’d rather err on the side of over-equipped than under-equipped.