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<?php

// check if the repeater field has rows of data
if( have_rows('outer_repeater_field_name') ):

    // loop through the rows of data
    while ( have_rows('outer_repeater_field_name') ) : the_row();


    // check if the repeater field has rows of data
        if( have_rows('inner_repeater_field_name') ):

            // loop through the rows of data
            while ( have_rows('inner_repeater_field_name') ) : the_row();

                // ТУТ ТИ ПОЛУЧАЕШЬ ДОСТУП К ПОЛЮ
                the_sub_field('sub_field_name');

            endwhile;

        else :

            // no rows found

        endif;

    endwhile;

else :

    // no rows found

endif;