tag:blogger.com,1999:blog-7230378150911426722.post3103672656994340639..comments2022-03-22T21:18:27.666+00:00Comments on Grace Filby's Pigeon Post: That Nazi gold train - just a thoughtElizabeth Grace Filbyhttp://www.blogger.com/profile/16102153203976807876noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-7230378150911426722.post-31289345951382684452015-10-16T17:04:09.034+01:002015-10-16T17:04:09.034+01:00Ha! Googling 'can you fly a drone in a tunnel...Ha! Googling 'can you fly a drone in a tunnel' and 'can you fly a drone in a sewer' I found the answer - YES YOU CAN!! Meet the drones patrolling the pipes of Barcelona's sewers: http://www.cnet.com/uk/news/meet-the-drones-patrolling-the-pipes-of-barcelonas-sewers/<br />They say "Currently, visual inspection and maintenance of these tanks and pipes requires workers to Elizabeth Grace Filbyhttps://www.blogger.com/profile/16102153203976807876noreply@blogger.com