Officials and defense experts said a minisub would have been difficult for even a nearby ship to track in shallow coastal waters.
From the thenewstribune.com
Gates meanwhile has found out that the German has smuggled over a minisub and plans to torpedo the Queen Mary with 15,000 troops aboard.
From the time.com
He was told by his relative, an oil field engineer in Alaska who was recently sent to Louisiana, the crisis could have ended early with an explosive charge placed in the hole by a minisub.
From the kentucky.com
Deep Flight's designer Graham Hawkes piloted the minisub on three shallow dives lasting about 4 hours in total, plus a brief fourth dive at its official launch ceremony 3 days later.
From the newscientist.com
More examples
Submersible vessel for one or two persons; for naval operations or underwater exploration
A midget submarine is any submarine under 150 tons, typically operated by a crew of one or two but sometimes up to 6 or 8, with little or no on-board living accommodation. ...