<P> At about 8 : 20 p.m. on 25 September 2007 , a hydrothermal eruption occurred without warning . William Pike , a 22 - year - old primary school teacher , had a leg crushed by a rock during the eruption and a rescue operation was mounted to rescue him from the Dome Shelter near the crater . The rock crashed into the Dome Shelter , landed on the man and was too heavy for his companion to lift off . </P>
when was the last time mount ruapehu erupted
At about 8 : 20 p.m. on 25 September 2007