In an emergency is it possible to baptise a large group of catechumens (around 100 or more) with a firehose or some other "group baptism" method, such as walking outside during rain? The catechumens would presumably consent to being baptised.
I imagine that if a group was baptised with a firehose, the Trinitarian formula would only be pronounced once, but I have a hunch that who ever is doing the baptising has to pronounce the Trinitarian formula each time for every individual in the congregation, but I'm not sure: it seems inconvenient, inefficient, infeasible and impractical in an emergency situation because it would take too long to baptise them all individually. It seems to be that a "group baptism" would be the most effective thing to do in an emergency, assuming that it is allowed.