The next file bears "INCIDENT 0101081998" and features a drawing of a plane and a snorkel.

Ruby: "Next we have incident 0101081998".

Shannon: "Got it."

Ruby opens the file to reveal its photo. It depicts a twin-engine Cessna plane diving towards a mountainside in a blur of white and red. A similar image is being displayed on Shannon's laptop screen.

Shannon: "I'm sure you've probably already guessed that this plane is about to crash, but not for the reason you may expect…"

The video begins with the plane in mid-air, barrelling towards the ground.

Date of Incident: 1 August, 1998

Location of Incident: Santa Catalina Island, California

As the video begins the plane banks to the left. We see the pilot in the cockpit at the controls.

Ruby: (Narrating) "The passengers in this twin-engine Cessna are, like, about to die. Cause of death…"

The plane slams into the mountainside in a fiery explosion.

Ruby: (Narrating) "...not what you might expect. Let's rewind and see the beginning of this story, shall we?"

A rewind symbol appears in the corner of the screen, and the video begins playing backwards through the plane's entire flight, past its landing to the point of the crew arriving. When the rewind is stopped, the video pauses for a bit, before cutting to a new scene which depicts three men on a yellow boat out in the ocean. The three men are seen engaging in a spot of SCUBA diving, admiring coral reefs and the colourful fish darting through them.

Ruby: (Narrating) "Richard Paxon and his two buddies had been exploring the reefs by Santa Catalina Island for the last three days. And they figured they could, like, squeeze in one last dive before heading home."

One of the divers is seen checking his pressure gauge.

Ruby: (Narrating) "After an hour's dive at 45 feet (13.7 metres) they decided to head back to the surface. They made sure to ascend slowly, so they could, like, release nitrogen gas stored up in their bloodstreams."

A shot of Richard and his friends slowly ascending to the surface is seen.

Ruby: (Narrating) "Decompression sickness, also known as 'the bends', is a major threat to anyone who SCUBA dives."

Eventually, the divers make it back to the surface. The view cuts to what appears to be a hyperbaric chamber. Several shots show both the outside and inside of the chamber.

Ruby: (Narrating) "The island is home to, like, one of the world's largest hyperbaric chambers. This word is derived from a combination of "hyper", which means above normal, and "baric", meaning 'of pressure'. A diver suffering from decompression sickness will be brought here for treatment."

A shot of the hyperbaric chamber in operation is shown.

Ruby: (Narrating) "Shannon, analysis."

Cut to Shannon in the office.

Shannon: "So, decompression sickness. As you dive deeper and deeper, breathing air through your SCUBA cylinder… the air in the tank has about 80% nitrogen to make it breathable, and so the deeper you go…"

A new shot of Richard underwater is seen.

Shannon: "...and the longer you stay underwater, more and more of this nitrogen will dissolve into your tissues. If you ascend too quickly the gas won't be released fast enough…"

A CGI shot of a blood vessel is shown, with bubbles of nitrogen gas visible in it.

Shannon: "...then it will form bubbles, which can gather around joints and cause pain on said joint…"

A CGI shot zooms out to reveal the whole human body, as red dots appear on the joints and nerves.

Shannon: "...or they can impinge on nerves, leading to paralysis."

After one more shot of Richard and his friends underwater, and a new shot depicts them approaching the plane seen in the intro. Richard feels up the plane's propellers and wings.

Ruby: (Narrating) "Richard was eager to get back into his new toy. It was a present he gave himself for acquiring his certification to, like, fly a twin-engine aircraft. In his excitement, he forgot one of the cardinal rules of diving: Never dive and fly the same day."

Richard and his friends open the doors of the aircraft and get in. Soon enough the propellers begin spinning, and the plane begins moving forwards, slowly at first, but gradually getting faster and faster until it tilts up and leaves the runway for the air.

Ruby: (Narrating) "As soon as the unpressurised plane took off and reached its cruising altitude of 12,000 feet (3,660 metres), Richard and his friends began to feel the symptoms of, like, decompression sickness kicking in.

A view from the back passenger seat shows the men beginning to sway in their seats.

Ruby: (Narrating) "Shannon, more analysis please?"

Once more we find ourselves in the office.

Shannon: "Certainly, Ruby-Tuesday. Now, the higher the altitude, the higher the probability of developing decompression sickness."

She holds up her tablet, which depicts the anatomy of the human ear, and points to the three circular canals above the cochlea.

Shannon: "In the worst-case scenario, nitrogen bubbles could form in the ear's semicircular canals which control your balance, causing symptoms such as vertigo, dizziness or nausea. Yeah, it's a really bad idea to fly after diving."

Cut back to the plane in the air. A POV shot from the back seat shows one of the passengers suffering from severe dizziness.

Ruby: (Narrating) "With Richard at the plane's controls, but losing control of his mind and body…"

In the air, the plane is seen making a steep left bank before beginning a dive towards a mountainside.

Ruby: (Narrating) "...it was like, a nightmare. The three men, incapacitated by decompression sickness, could only watch in horror as their plane plummeted straight into a mountainside."

The plane ploughs into the mountainside and explodes, a bright orange fireball blasting out from the impact site. The image turns grayscale.

WAY TO DIE #713

DIVE BOMBED

Back to the Sharuby couple in their office.

Ruby: "You know, decompression sickness has been haunting humans ever since we, like, began doing work underwater. During the construction of the Brooklyn Bridge in New York City back in 1870, many workers came down with decompression sickness, an unknown illness at the time. After working on the support pillars under a special enclosure to keep the East River out, and when they came out many doubled over in pain, leaving many crippled and some dead."

Shannon: "Grim. Anyways, next file, please. My turn to narrate."

Ruby nods, marking the file and wheeling over to get the next one.