This business idea is dangerous.
The idea is to find buried valuables in strategic areas.
You can use a simple metal detector or a more modern device which shows more precise readings on a digital display.
I recently stumbled upon Sensor & Software products such as:
”FINDAR® uses ground penetrating radar (GPR) technology to enable law enforcement to quickly and effectively search for evidence buried under the ground.”
”Ground penetrating radar to detect both shallow and deep targets simultaneously.”
Either of these devices look very advanced for searching things under ground.
Now that you have got a tool to find the buried treasures next you should know where to look after them.
My approach to this would be to go to areas where there were war activities, trade routes, marketplaces, rich people living areas etc in the past.
To find these locations you could visit your local library and look for the history of the area you are in to find specific places in the map where the hot activities were taking place.
I would personally like to use one of the devices above because I think they could read out if there is a grenade, mine or missile underground which could be potentially dangerous.
You may also search for items next to bridges and roads that have water lines right next to them. That is the area where people lose things by accident or on purpose.
For example, check out this YouTube channel – https://www.youtube.com/user/DALLMYD
For seriously added bonuses you can make a YouTube channel out of it and perhaps grow it into a million subscriber wonder!