Question: where was black mirror season 3 episode 4 filmed
[{'answer': 'Iceland', 'provenance': [{'wikipedia_id': '55024666', 'title': 'Crocodile (Black Mirror)', 'start_paragraph_id': 2, 'start_character': 10, 'end_paragraph_id': 2, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55024666', 'title': 'Crocodile (Black Mirror)', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 434, 'bleu_score': 0.972407137066537, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1833356697172281340}, 'section': 'Section::::Production.\n'}]}]