The media release from HDR of 10/9-04 said:"The top hole section on these wells varies from approximately 600m. to 1000m.of drilled hole." in to days media release from HDR,the Dorado-1 well had its casing run and cemented at2347m. depth.I think you will have to deduct thr water depth of 1670m. from that.The drilled lenght will then be 677m,and 1983m. more to go.