Welcome to the world of the Pa-aling divers, perhaps the most dangerous fishing method of all.

80 men, many of whom are still teenagers, are preparing to dive to over 40 meters, breathing air pumped through these makeshift tubes by this rusty compressor.

Joseph is one of the youngest aboard, but he's aware of the risks.

...Diving with a compressor is dangerous...

He's already witnessed just how lethal his job can be.

...A very close friend of mine died...

...We tried to resuscitate him but failed...

...He said he wanted to take a break, but it turned out to be goodbye...

The seas around the Philippines were once rich with life, but they've been so over-exploited that decent fish numbers are only found at perilous depths.

The divers guide the huge ball of nets 40 meters down to the sea floor, but all the while their air supply is at risk.