Near the end of the 1st episode of season 2, these fellows presented their Nuclear Magnetic Resonance map of the island, showing various tunnels and metals locations. Robert and Bob Leonard.
Their map, (and their technology), if proven by some test diggings, is potentially an amazing breakthrough for discovery in the Oak Island project. Proving things by test digging will likely be a recurring theme on future episodes.
We also see them performing the electrical conductivity mappings.
I think this is a less processed, more raw data, kind of overlay, of NMR data overtop of the google earth image.