For those of you who know or think you experienced trauma, how do you explore it in therapy if you don't have memories of it?

(Maybe a third party confirmed something bad but not in detail or you have unexplained body responses to certain triggers)

What makes my situation frustrating is that there is plenty of bad stuff I do remember before age 5 but the rest I don't have access to.

Is this what somatic therapies are for? Thanks in advance for your thoughts and experiences.