I just saw this rather frightening proposal in Alabama to change the state law to allow treasure hunters to take artifacts from archaeological sites located underwater in rivers, streams, and lakes. This isn’t just a problem of taking the artifacts themselves, although they are a very finite resource, but of the loss of knowledge about the past. In many (I would even say most) cases, the vast majority of scientific and historical information that can be obtained from a site is derived not from individual artifacts, but from their context. Once removed from that context, any information not recorded at the time of collection is gone forever.
If any of my readers live in Alabama, please contact your State Senator and tell them not to allow treasure hunters to loot the past.