Try to follow along.

You: the two Brits were risking their lives.

Me: Not really, they'd have been following standard cave diving safety protocols.

You (effectively): Well, a Navy Seal just died, so that proves that it's dangerous.

Me: There's evidence that the Navy Seals weren't trained cave divers - they certainly didn't seem to be equipped as such - so all it proves is that cave diving is dangerous to those without specific training and/or proper equipment - navy seals or otherwise.

You: you'll change your tune if one of the brits dies!

W-T-F?

Here's a short list of how the diving equipment in some of the photos is absolutely noncompliant with proper cave diving equipment. This implies to me that they are not trained cave divers, and consequently, the risks they unknowingly took were enormously greater than the risks the two brits took:

(1) Single tanks! Fine in recreational diving, because if something goes wrong with your air supply (tank valve fails, hose bursts, regulator falls apart, whatever), you can go to your buddy for air, or at worst, bolt to the surface. No good in cave diving, where there isn't any air at the surface, and your buddy might be 20 meters away at the other end of a tight restriction. So all cave divers use twin tanks. We also follow gas management rules designed to let us survive the following two scenarios: (a) At the point of maximum penetration, you get separated from your buddy, and simultaneously, one of your two tanks completely fails; and (b) at the point of maximum penetration, you're still with your buddy, but both of your (or his) two tanks fail. Diving on a single tank is fundamentally noncompliant with all those standard safety protocols.

(2) Hoses curving out around their heads. These are common in recreational diving, but a serious entanglement hazard in cave diving. Cave divers route all their hoses tight-in, to reduce entanglement risks. This is especially important in low or no visibility diving. No properly trained cave diver would leave the house with hose routing like that in some of those photos. Even if an experienced cave diver was forced to use that gear by circumstance or in a dire emergency, she'd fix that up before she got in the water.

(3) K-valves! The top of each tank has a valve, onto which you attach the first stage pressure reduction regulator. Those valves come in two styles: K-valves, and DIN valves. Each style has a rubber O-ring to seal the regulator onto the valve. With K-valves, the O-ring can squeeze out, causing the attachment to fail. That's rare, but can happen. Bad luck if you're a kilometre into the cave - on a single tank - with your buddy at the other end of the restriction!! With DIN valves, the O-ring is trapped entirely within the valve body, so it can't pop out. For that reason, few if any properly trained cave divers would use K-valves.

(4) Funky hand held torches! They probably throw a nice wide beam, which is good for recreational dives. But cave divers need narrow beams (to cut through the murk, and facilitate signalling); with multi-hour durations, and hands-free attachments so you can use that hand for other tasks.

In summary, someone who is an experienced brain surgeon, gets into a Formula One car, prangs it, and kills himself. To me, that doesn't say much about the safety of properly trained and qualified Formula One drivers.

But you say that the death of a person, who may have had zero formal training in cave diving, says something about the safety risks the two brits took? Perhaos two of the most experienced expedition cave divers in the world?

I think you do not understand the issues. I don't intend to reply again.