EB Green duct tape

[snopes]

EB Green is found throughout the Navy and rumored to originate from the Electric Boat shipyard, hence the name. If you’re a US Submariner (current or former) you probably heard stories about and experienced the unbelievable strength of “EB Green” duct tape. This stuff is not your Home Depot run of the mill duct tape; I swear when applied properly its just short of epoxy backed Kevlar.

The one famous EB Green story, and possibly a submariner version of an urban legend, is how it survived a trip to test depth. The story goes that an un-named submarine went to sea from the shipyard on builder's trials. During the at sea period the submarine made at least one excursion to test depth. Upon the sub’s return to the shipyard, and a trip into the dry dock, it was discovered that a small area on the pressure hull had some EB Green tape on it. The patch of tape had been over painted and not noticed during construction. The tape was removed so that the hull could be properly painted and a hole was discovered that went “all the way through the pressure hull” to the submarine interior. The EB Green tape had saved the submarine from a certain flooding causality.

http://lubbers-line.blogspot.com/200...n-legends.html

[Troberg]

No, it simply will not happen. It's tape, not magic. The pressure would punch straight through it, there is no way that it would survive. Nothing short of a good weld will hold that pressure back.

Look at the mythbusters episode where they stop the air pump to a hard hat diver suit, and the diver simula is pushed into the helmet by the pressure, and you'll understand what that pressure can do.

[RichardM]

It still makes a good story. In racing, we choose our tape first by the color of the car, rec for my wife's Formula Ford and white for my SAAB 99 and secondly by how fast you are going to go, i.e. 100 mph tape, 150 mph tape or 200 mph tape.