How do you use unzip_file()?

by 

require_once(ABSPATH .'/wp-admin/includes/file.php');

global $wp_filesystem;
if ( ! $filesystem ) {
  WP_Filesystem();
    if ( ! $wp_filesystem )
      nuke_the_world_because_wpfs_cannot_be_initialized_in_case_of_missing_arguments('!');
}

$result = unzip_file( $zip, $dest );
if ( is_wp_error( $result ) )
   nuke_the_world();

Maybe some error handling make it easier.

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