A 24-foot-long robotic submarine has been cruising the waters of Lake Tahoe, practicing for an expedition to the Antarctic.
Lake Tahoe Submarine
![](https://npr.brightspotcdn.com/dims4/default/e69d228/2147483647/strip/true/crop/150x116+0+0/resize/880x681!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Flegacy%2Fsites%2Fdefault%2Ffiles%2Fpublic%2Fimages%2Fstory%2Fsubmarine.jpg)
A 24-foot-long robotic submarine has been cruising the waters of Lake Tahoe, practicing for an expedition to the Antarctic.