Its real simple go look for the treasure, or don't ... same for risking your life mountain climbing or back country skiing.  YOU know YOU can kill YOURSELF pursuing these activities.  Oh boy how many rescues do we read about in the Denver Post ALL THE TIME, people die pursuing those activities all the time.  Many many more so than 'treasure hunters'.

Perhaps we should require an insurance bond before people mountain climb or back country ski to recover the fairly consist costs to cover those 'activities' that endanger human life ... ??!!

Don't be glib or condescending.  Personal responsibility is the key aspect to all these activities.