If you don’t have a mahram, even if you were 1000 women, this is prohibited to travel.

I have a question in regards to women travelling. I will be given an opportunity in my 3rd year of Nursing in sha allah when I shall be 22 years of age to travel to 3rd world countries in order to help sick and needy children and people. There are going to be more than 100 women travelling would I be permitted to travel without a Mehram in this case?