come spring , divers promised they 'd go back in , and once again proposals to drain and then cover the quarries with landfill were raised , and quincy city officials who worried about the millions of dollars it would cost found strange bedfellows in preservationists who warned that filling the quarries would damage the environment and destroy a multitude of scenic vistas for hikers and walkers , deprive the people of quincy of sites of great historical significance , and eradicate some of the best rock climbing in the state .