u2noob
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I placed a Tower on turn 112, but my opponent didn't give up and almost managed to win.
Early digging is quite rare, plus there are many drawbacks in terms of poor scouting, heroes standing still, and so on.
In short, digging for the Grail comes at the expense of exploring the map and maintaining momentum, and it's unclear which will yield more benefits.
It happened a while ago when I was playing in the Club with Yura - Virusom, and he dug for it on turn 115, also for a Tower, and believe me, on the eighth turn, it was very unpleasant. At the same time, only one hero was involved in the digging, and he started digging from turn 113.