How to load programmatically webform submissions in Drupal 8

Code snippet that can be used to load programmatically webform submissions in Drupal 8.

$webform = \Drupal\webform\Entity\Webform::load('WEBFORM_ID');  
if ($webform->hasSubmissions()) {
  $query = \Drupal::entityQuery('webform_submission')
    ->condition('webform_id', 'WEBFORM_ID');
  $result = $query->execute();
  $submission_data = [];
  foreach ($result as $item) {
    $submission = \Drupal\webform\Entity\WebformSubmission::load($item);
    $submission_data = $submission->getData();
  }
}

if Entity query of webform submissions returns no results try to add accessCheck(FALSE) to the query like this 

$query->accessCheck(FALSE)->execute();