The missing Titanic tourist submarine was not approved by any regulatory body - meaning all passengers had to sign a waiver before the $250,000 (£195,000) trip.
CBS Sunday Morning reporter David Pogue, who encountered problems himself on a previous OceanGate trip, claimed that the submarine appeared to be "improvised from off-the-shelf parts".
He also recalled a waiver that read: "This experimental vessel has not been approved or certified by any regulatory body, and could result in physical injury, emotional trauma, or death."
