Monterrey Shipwreck B is different than Monterrey A and C. It contains a great deal of organic material and the hull is not copper sheathed like the other two. Monterrey B likely represents a merchant vessel dating to the early 19th century and carried a cargo of animal hides and large white blocks. The composition of these blocks is unknown, but they may be tallow rendered from animal fat. This photo shows several rolls of hides and a white block in the far left foreground. Several unopened wooden crates remain intact and the ship's stove is in the background. Image courtesy of NOAA Okeanos Explorer Program, Gulf of Mexico 2014 Expedition.