Diving Robbers Are Looting Underwater Treasures, Archeologists Wail

Diving robbers looting underwater sites are the bane of marine archaeologists. The items stolen from the sea floor, ranging from coins to amphorae to a life-sized bronze statue of Apollo to scrap metal from World War II warships, are usually sold on the black market. Worse, stopping the ravage of the ancient sites is all but impossible, the authorities admit: they can hardly post underwater guards. The problem of maritime looting is especially acute in Israel, say experts. The narrow Levantine coast has been inhabited throughout human history and traces of long-vanished civilizations remain on land and under water, observable to intrepid divers. A least if they dive soon, before thieves steal the lot and ruin the rest. 

Philippe Bohstrom, "Diving Robbers Are Looting Underwater Treasures, Archaeologists Wail" Haaretz Mar 15, 2017
The problem is that they cannot possibly investigate all these sites given the resources available. Would it not be better to work with the treasure seekers rather than try to fight them and "wailing" about their successes? This has worked well in other countries, such as Britain, why not here??