premise: Several people are wading in a river in a deep gorge.
hypothesis: Several people are wading ina  dangerous river that may cost them their lives.
explanation_1: People wading in a river in a deep gorge does not infer that the people are wading in a dangerous river that may cost them their lives.
explanation_2: In the first sentence it does not reference the river as being dangerous.
explanation_3: A river in a deep gorge may not be dangerous and it may not cost them their lives.
premise_logic: exists e1 s1 s2 x1 x2 x3.(in(e1,x2) & in(x2,x3) & n_gorge(x3) & a_deep(s2) & Theme(s2,x3) & n_river(x2) & Actor(e1,x1) & v_wade(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))
hypothesis_logic: exists e2 e1 p1 s1 s2 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_wade(e2) & exists e3.(Recipient(e3,x1) & Theme(e3,x4) & Actor(e3,x3) & v_cost(e3)) & n_thing(x1) & n_thing(x1) & n_life(x4) & of(x4,x1) & Topic(e1,p1) & Actor(e1,x3) & v_may(e1) & (x2 = x3) & n_river(x2) & a_dangerous(s2) & Theme(s2,x2) & r_ina(x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))