Question: where was the world's first nuclear powered submarine built
[{'answer': 'Groton , Connecticut', 'provenance': [{'wikipedia_id': '312510', 'title': 'USS Nautilus (SSN-571)', 'start_paragraph_id': 28, 'start_character': 41, 'end_paragraph_id': 28, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::"Underway on nuclear power".:Operational history.\n'}]}, {'provenance': [{'wikipedia_id': '312510', 'title': 'USS Nautilus (SSN-571)', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 339, 'bleu_score': 0.927897523069734, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1731406583786459103}, 'section': 'Section::::Planning and construction.\n'}]}]