In actuality, studies show that with fatal buddy diving incidents, 57% of deaths happened after the buddy pair had separated from one another during the emergency. Again, these cases could be attributed to failure of the buddy system rather than failure of any solo diving/self sufficient diving system. A further complication in such statistics is that certain more dangerous diving practices (e.g. cave diving) are frequently carried out solo. Therefore, it is questionable whether a death in these circumstances should be attributed to solo diving or to cave diving. Analysis of the figures used by BSAC to categorise solo diving as dangerous shows that during 2001–2008 all but one of these "solo diving deaths" were actually paired buddy divers that became separated during or before the fatal incident (75%) or else were divers diving far outside of the limits set by both SDI and PADI for the practice of solo diving (20%) (i.e. actually deep divers, rebreather tech-divers, and/or cave divers). Two further "solo-diving deaths" were not scuba divers at all, but snorkellers.