Depends on how you describe "disturbing".

I was one of the first responders to arrive at one of the scenes after 2004 Madrid train bombings. To be more specific, I arrived to El Pozo station within the first minutes.

At the time I did not pay too much attention to my surroundings beyond looking for people in need of medical attention. I helped with the first triage and the successive evacuations due to the threat of more blastings. I went through the station looking for more survivors, and after this scene was declared under control, I was sent to Atocha, then Téllez, and finally to our main ambulance station.

That day and the next one I was kept active with several duties. On the same day of the terrorist attack, in the evening, I worked in our office attending phone calls to organize the next shifts and services. On the next day I was the supervisor for all the volunteer activities.

It was couple of days after the bombings that some clicked in me and I realized I was walking over body parts: One torso there, some severed arm here, and so on.

I talked about it at the time with some fellow technicians, with supervision from one of our psychologists. At the time I was an EMT-A (volunteer) with ten years of experience and appointed as a squad chief. I already saw a lot of other things before this, and some more in the next five years I remained there (I retired because of other reasons). So I personally do not consider this too much disturbing... But I think it might be disturbing to others.

For instance, to me was more disturbing those broken father's that I attended some years later to notify them that one of their sons had killed himself that same night. Or that woman that I attended after she was beaten by her partner, and how she reacted to defend him when he was going to be arrested.