Translation of "들더군요" in English

그 순간 이런 생각이 들더군요.

And a thought occurred to me:

‎이런 의문이 들더군요 ‎'물속에서 ‎추적하는 게 가능할까?'

I just thought, "I wonder if anybody could ever track anything underwater?"

‎제가 문어에게 큰 가르침을 ‎받았다는 생각이 들더군요

And it hit me how she was teaching me so much.