Footage taken from the top of an Amphibious vehicle shows Marines experiencing a catastrophic vehicle failure as they attempt to conduct a water crossing.

Marines are amphibious by nature. It's not uncommon to see them crossing rivers in lightly armored amphibious vehicles. In fact, it's a core competency that a majority of Marines in ground combat roles need to have experience in, especially as the Marine Corps has started reverting back to it's maritime roots with the conclusion of the wars in Afghanistan and Iraq.

What is uncommon, is seeing one of those lightly armored amphibious vehicles suffer a catastrophic failure. Generally speaking, before one of these vehicles enters the water, the vehicle has been prepped to make it's way across the water. This involves the vehicle commander conducting a full inspection of the vehicle to make sure all of the proper plugs are in place, and all of the hatches are correctly shut.

According to a Marine who recovered this specific vehicle, none of those steps were properly taken. To add the cherry on top, shortly after the vehicle hit the bottom, the vehicle commander bailed from the top of the vehicle and swam to shore, leaving the rest of the Marines sitting on the roof since the vehicle wasn't fully submerged.