Is there such a thing as a underground radar?

Question

cause for the summer im going to an island and i want to do something like search for treasure scuba diving and looking for fossils that stuff like archeaology

Answer 1

It would cost you about $2000 to rent for a week.  If you just brought along high frequency antennas you could take it on an airplane no problem.  I have used them some in mining to find voids where gem crystals would be located. It takes a while to learn how to use them efficiently.

Answer 2

Yes.  Go to:

http://www.geomodel.com/

Although I don't think this is what you want.  There are professionals who search for sunken treasure.  They do use specialized tools and equipment.

Answer 3

Yes there is.

In general they are very expensive, you can rent them but (no-offence) I doubt you have the dough.

They are also fairly bulky machines so you couldn't take one on a plane, or any real distance unless you like travelling light in big cars.