How can I understand the words ' right down ' ?
Please read the sentence firstly: We like to trace every piece of fish right down to the boat and the fisherman. How can I understand the words ' right down ' ?

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The phrase is 'right down to'. The idea is 'fully' or 'completely. 'Right down to ...' is 'fully, as far as...'. 
'Take off your clothes please, right down to your underwear'.
'They disassembled the engine, right down to the last bolt'.