Loooool. Paywall, obviously. Hate this kind of predatory shit.
Save your money, guys, let me give you a quick rundown of a dungeon survival guide, for free:
Don't panic. A dungeon does not want you dead. Leaving a dungeon under your own power makes for a nice news story, but usually the smart thing to do is stay put and wait for rescue. If the dungeon clearly wants to elicit a reaction out of you, try to cooperate. This is for two reasons: one, it is safer for you, as dungeons will sometimes start trying to persuade its victims into playing along, and this is usually worse than what it originally wanted from you, and two, if you are being a good smart nutritious human, it will waste less resources trying to deal with you. This gives you more space to advocate for things you actually need. Like water. Or food. Or getting to work with other humans.
Which is point two. Your best 'resource' in a dungeon is other people. This is primarily in the people whose job it is to rescue you, which by the way you should stay put, stay alive, and maybe yell for when you hear gunshots so they can find you, but it's also in other kidnapping victims. Band together if the opportunity arises. New dungeons (which are what most people who are kidnapped by dungeons get grabbed by1) are not very good at understanding how humans can work together. Keep each other calm and safe.
Third: if dungeons really scare you, the best way to deal with them is preparation. Wearing a canteen strapped to your belt has gone a bit out of fashion lately, but the thing that is most likely to kill you in a dungeon is dehydration. So. Wear one with you to the grocery store, to work, hell, to bed if you're really nervous. Carry a pocket knife - not as a weapon, as a tool, for changing your environment to fit your needs - or multitool with you. Wear practical shoes and adjustable layers.
But, really: in this day and age, if you are kidnapped by a dungeon, you will be okay. Sit tight. Stay calm. Stay alive. Help other humans you see. Wait for rescue. It will come.
1A link to a page on dungeon statistics, and what types of dungeons are most common.