A plaque marks the site of David's Drill (Te Vili o Tavita) where in 1897 a team from the Royal Society of London led by Professor Sir T.W. Edgeworth David bored 698 feet down into the atoll to test Darwin's theory of atoll formation. #DavidsDrill #TeVilioTavita #RoyalSocietyofLondon #TWEdgeworthDavid #Darwin