Questions regarding the ethical validity of government heritage policies and whether they sufficiently protect important remains are raised during cases such as High Speed 1 in London where burials at a cemetery at St Pancras railway station were hurriedly dug using a JCB and mistreated in order to keep an important infrastructure project on schedule. Another issue is the question of whether unthreatened archaeological remains should be excavated (and therefore destroyed) or preserved intact for future generations to investigate, perhaps using more advanced techniques that could provide more detailed information. Some archaeological guidance such as PPG 16 has established a strong ethical argument for only excavating sites threatened with destruction. Problem Areas in Archaeological Ethics