The Blue Hole in the Red Sea is the deadliest dive site in the world • Hacker News Board

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#261

Post by ghaff » Wed, Apr 28, 2021, 2:03 AM UTC

mauvehaus wrote: post #260

ghaff wrote: post #217

Earlier quoted context omitted.

Yeah, that's the case and the book I was talking about. The actual accident, while obviously very tragic, wasn't especially interesting. Basically don't try to do a Presidential Traverse during the worst weather in about 20 years. It was actually a different situation from the more common cascading failures mode of accidents. She made a grave error by deciding to drive up to NH that weekend and a fatal one by continu…

I think the big takeaways for my partner and I were a little more nuanced. With all respect to Kate Matrosova and acknowledging that we don't have any knowledge of her thoughts that day: 0) Her mileage to the top of Madison was off by about a mile on her written plan. Not a good place to start for an ambitious day. 1) Most of her prior experience was guided where somebody else was responsible for making the decisions…

I know he has another book out which wasn’t available when I bought this one. I’m actually involved with a winter hiking program which is how I found out about this one because I’m usually involved with leading winter trips in New England.

To your point, I agree and think I touch on most of them upthread. Weather is definitely an an important consideration. She hadn't mostly been involved in making tough calls.

And, yeah, she had opportunities to bail after driving up from NY. But clearly she wasn't going to do that prior to seriously going for Adams at which point it was too late given the weather.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#262

Post by dylan604 » Wed, Apr 28, 2021, 2:03 AM UTC

ant6n wrote: post #215

grawprog wrote: post #155

Earlier quoted context omitted.

We had a similar one of those in school. The first question of the test was 'read all questions before you start.' Then it had stuff like poke holes in the paper, draw things, random stuff, the very last question though was, 'Now that you've read all the questions, just write your name in the top corner and turn your paper over.' Yeah...a lot of my classmates ended up with holes and scribbles on their tests...

It’s pretty ambiguous, though. In tests you usually complete all questions. Why should you in this instance only complete the first and the last task?

If you are still unsure of the why, then you have had a fortunate life. There are many times you will get a set of "instructions" where somewhere something is wrong or incomplete, but you won't know that until you've worked your way through them. Ikea comes to mind. It is often very helpful to read through all of the steps involved first to make sure you actually have all of the parts/pieces you need and to make sure they make sense before starting. So I say again, that if you've never run into one of these situations, then you've been lucky.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#263

Post by claviska » Wed, Apr 28, 2021, 2:14 AM UTC

grawprog wrote: post #155

ethbr0 wrote: post #124

Earlier quoted context omitted.

First class of dive course at CWRU: Older Navy diver instructor walks in "So I know each of you is coming into this class with different levels of experience. What we're going to do first is a short test on your proficiency for 20 minutes. It will be graded on completeness, not correctness. You are not expected to know all the answers. I'm just interested in gauging what you know. Be aware, there are a lot of questio…

We had a similar one of those in school. The first question of the test was 'read all questions before you start.' Then it had stuff like poke holes in the paper, draw things, random stuff, the very last question though was, 'Now that you've read all the questions, just write your name in the top corner and turn your paper over.' Yeah...a lot of my classmates ended up with holes and scribbles on their tests...

I was one of the kids with holes in my paper. It taught me an immediate and memorable lesson. Attention to detail.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#264

Post by ethbr0 » Wed, Apr 28, 2021, 2:47 AM UTC

watwut wrote: post #221

ethbr0 wrote: post #124

Earlier quoted context omitted.

First class of dive course at CWRU: Older Navy diver instructor walks in "So I know each of you is coming into this class with different levels of experience. What we're going to do first is a short test on your proficiency for 20 minutes. It will be graded on completeness, not correctness. You are not expected to know all the answers. I'm just interested in gauging what you know. Be aware, there are a lot of questio…

Those who followed first sentence instruction did correctly one question. And ignored all the others in test that was supposed to be graded on completeness. He also claimed the goal was to gauge their knowledge. Again, that was lie. And those who scribbled were literally trying to fulfill stated goal of test. > It will be graded on completeness, not correctness. You are not expected to know all the answers. I'm just…

Given a set of mutually conflicting directives, one must exercise discretion to prioritize. I felt (at the time and reflecting on the experience now) that it was clear which held the higher priority.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#265

Post by noodlenotes » Wed, Apr 28, 2021, 2:48 AM UTC

nkassis wrote: post #239

Nursie wrote: post #151

Earlier quoted context omitted.

We had a Chemistry teacher who tried a similar sort of thing on us when I was about 17. "OK class, today's lesson is going to be a dictation, get your books out and start taking this down" I can't remember the exact content but effectively he started off with some familiar organic chemistry and then veered off to stuff that was pretty obviously wrong. I'm proud to say that I'm the one that said "Eh ... that doesn't s…

I was not a great student but at one point in college I realized that I wasn't listening while taking notes. I was just mindlessly copying everything exactly as was written on the white board missing out on what my teachers said. I stopped taking notes at this point and started paying attention instead. My grades improved. This might not work for everyone but something to try if you struggle retaining lecture content…

I've found that taking notes in cursive helps my listening comprehension, for whatever it's worth. But it makes it harder to use my notes as a reference later.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#266

Post by professoretc » Wed, Apr 28, 2021, 3:17 AM UTC

ubermonkey wrote: post #76

permo-w wrote: post #63

Earlier quoted context omitted.

top tip: most humans can float as long as their lungs are full

Being super lean and carrying mass in large muscles will ruin this, fwiw. In my late 20s I was militantly fit and also very into rock climbing. I supplemented this with some lifting to balance things out; people who ONLY climb end up looking a little weird as the lats develop out of proportion with the rest of you. Anyway, even with a lungful of air, my neutral buoyancy point was like 8-12" below the surface. Alas, I…

Same here when I was younger (i.e., less fat). With a full breath of air in me, I'd float, but exhale a bit and I could sink to the bottom of a 12 ft pool without any effort on my part.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#267

Post by alexhutcheson » Wed, Apr 28, 2021, 3:50 AM UTC

chha wrote: post #5

epaga wrote: post #3

Earlier quoted context omitted.

Though I'm sure it's a fascinating interview, I thought the article was really well-written and helpful. I really enjoyed the pace of it all.

You might also like this story about a dive in Boesmansgat: Raising the Dead[0] [0] - https://www.outsideonline.com/1922711/raising-dead

You might also like this one about a dive in Norway: The cave divers who went back for their friends[0]

[0] https://www.bbc.com/news/magazine-36097300

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#268

Post by Griffinsauce » Wed, Apr 28, 2021, 5:21 AM UTC

pengaru wrote: post #199

throw1234651234 wrote: post #166

Earlier quoted context omitted.

This is an irrational party(professor) trick that wastes everyone's time. An argument could be made for "read the (short) instructions at the start". An argument cannot be made for this. There is often very little value to skimming the entire question set before the exam.

It's been a very long time since I had to do any tests, but back in my school days, with multiple-choice tests, I evolved a method of quickly answering everything I was confident to know 100% throughout the entire test in a first pass, reserving the rest for subsequent increasingly slower passes. What tended to occur was the earlier fast passes at the very least warmed up the cache upstairs, and some previously uncle…

I used the same method and can confirm it was very effective for me as well.

An added bonus is reduced stress about time limits. After the first pass you have a big chunk (if not most) of the test done in little time - this feels good and also leaves you with a clearer idea of how much work and time is left.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#269

Post by closeparen » Wed, Apr 28, 2021, 5:27 AM UTC

lazyasciiart wrote: post #253

hellbannedguy wrote: post #229

Earlier quoted context omitted.

In the United States, cops pull over most bikes, especially after 10 pm. It's almost like they just hate bikers? The bikers I know are not getting buzzed at the local watering hole, and aiming the bike home. It's not the 70's. In my county, the fatal bike crashes are usually new high end high performance bikes, on country roads. They are experienced, but pushing it. They are cold sober. The days of having a few beers…

Marin County will also pull you over on a bicycle because they don't like cyclists. And issue several hundred dollar tickets for going too fast, passing cars while they are stopped in a turn lane, riding over a crosswalk with small children... https://twitter.com/WarrenJWells/status/1386328677378494468?...

Thanks for this thread. A weird experience makes sense now: I met this man when he was on a bike. I figured it was a local asshole trying to be aggressive to a stranger in front of the woman he was riding with, with maybe 20% odds of also being an off duty cop.

Either that, or the Sausalito community just really shares a passionate opposition to cyclists rolling along the uncontested sides of quiet T intersections.

Re: The Blue Hole in the Red Sea is the deadliest dive site in the world

#270

Post by ant6n » Wed, Apr 28, 2021, 5:52 AM UTC

dylan604 wrote: post #262

ant6n wrote: post #215

Earlier quoted context omitted.

It’s pretty ambiguous, though. In tests you usually complete all questions. Why should you in this instance only complete the first and the last task?

If you are still unsure of the why, then you have had a fortunate life. There are many times you will get a set of "instructions" where somewhere something is wrong or incomplete, but you won't know that until you've worked your way through them. Ikea comes to mind. It is often very helpful to read through all of the steps involved first to make sure you actually have all of the parts/pieces you need and to make sure…

I’m not questioning that you should read all the questions, I’m saying it’s ambiguous what you should do if you’re given the following task list:

    1) read all tasks
    2) do x
    3) do y
    4) do z
    5) now that you have read all tasks, just write your name and do nothing

I don’t understand why I should not do x,y,z. Task 1 is telling me to read all tasks, not to execute any. Why should one, when reading 5), decide to execute that particular one, but not the other ones?

To me, the correct procedure would be to read all tasks (task 1), then continue executing task 2), etc.