Copan By lllacombe Apr 25, 1997 Winter of 1997: significant collapses in Pato tunnel network, according to Cruz report of 1998 Apr 25, 1998 David Sedat begins to notice water leakage problems Apr 25, 1998 Greenstone Mining Co of Honduras installs membrane Oct 22, 1998 Hurricane Mitch Feb 15, 1999 Fernando Lopez encounters 3 collapses