| Clue | Source | Date |
|---|---|---|
| Get stuck on a sandbar, perhaps | USA Today | 22 Nov 2017 |
| Get stuck on a sandbar, perhaps | ||
| Underestimate the depth, maybe | The Washington Post | 26 Dec 2016 |
| Not pass the bar? | New York Times | 22 Aug 2015 |
| Not pass the bar? | ||
| Have a shipping mishap |