Snap: How to accede to snap action codes

Hello everyone. During SNAP installation, I have seen that there is the option to install something for SNAP/Python interface. My question is: Is it possible to see the codes relevant to snap actions like baseline calculation, speckle filtering in order to understand how this operations are implemented in the software?
I hope to have benn clear in the exposition. Thank you.

Where the source code can be found is explained on the web page.
The following developer guide might also be of interest for you:
baseline calculation and speckle filtering you will find somewhere in the s1tbx.

thank you!