Some historians also believe that the official archival figures of the categories that were recorded by Soviet authorities are unreliable and incomplete.[1] In addition to failures regarding comprehensive recordings, as one additional example, Canadian historian Robert Gellately and British historian Simon Sebag Montefiore argue that the many suspects beaten and tortured to death while in "investigative custody" were likely not to have been counted amongst the executed.[69][70] Conversely, Australian historian Stephen G. Wheatcroft asserts that prior to the opening of the archives for historical research, "our understanding of the scale and the nature of Soviet repression has been extremely poor" and that some specialists who wish to maintain earlier high estimates of the Stalinist death toll are "finding it difficult to adapt to the new circumstances when the archives are open and when there are plenty of irrefutable data" and instead "hang on to their old Sovietological methods with round-about calculations based on odd statements from emigres and other informants who are supposed to have superior knowledge".[71][3]