Question: when was the channel tunnel first thought of
[{'answer': 'as early as 1802', 'provenance': [{'wikipedia_id': '5702', 'title': 'Channel Tunnel', 'start_paragraph_id': 3, 'start_character': 46, 'end_paragraph_id': 3, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5702', 'title': 'Channel Tunnel', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 648, 'bleu_score': 0.8652119094105881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9357000427233161739}, 'section': 'Section::::Abstract.'}]}]