Question : I was saved by someone while I was drowned in the river.

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Sep 5, 2015 11:05
I have a question.
A few days ago, someone corrected this sentence that I wrote.

I was saved by someone while I was drowned in the river.
(僕は川で溺れているところを、何者かに助けられた。)

He/she said that I should use "when" instead of "while".
Is this correct? Can't I use "while" in this situation? Is it unnatural?

I need your help for my understanding.

Thanks in advance.