Picking up Simon's point, in the 60's when Industrial Archaeology was just beginning, wet suits were just being home made, we all thought it was the beginning of a new age of a different type of exploration.i.e. Mine exploration.
Now some 50 years on the picture is somewhat different.
We have new, reliable, technical, gear and the knowledge where disused mines are and what is required to look inside them.
Progress in exploration still lies ahead of us, it might mean more effort is required to make these major brake throughs, but since each decade has its own discoveries, there is no real golden decade.