About DeepCave

A trip underground runs on numbers you can’t eyeball. How much rope actually reaches the bottom of a pitch, with enough left over to rig it safely? How long will a headlamp really run on a given lumen setting before it dims? What does a passage’s compass-and-tape survey actually add up to in horizontal distance and depth? DeepCave exists to put that arithmetic in front of you before you rig a rope or clip into a harness — not to replace training, a mentor, or a rope-work course, but to make the planning math fast and repeatable.

Rather than long articles you have to read end to end, the site is built around a handful of small, single-purpose calculators, each aimed at one planning decision. The Rope Length Calculatorworks from a pitch’s depth, rigging style, and rebelays to the total rope you need to carry. The Headlamp Runtime Calculatorturns a battery’s capacity and a light’s draw at a given brightness into hours of real burn time. The Cave Temperature Layering Guidemaps a cave’s year-round temperature and your trip’s length and activity level to a clothing system that won’t leave you chilled or sweat-soaked. The Passage Survey Distance Calculator reduces compass, clinometer, and tape readings into horizontal distance, depth change, and total passage length. The Air & Ventilation Guideestimates airflow and a rough CO₂ build-up in a poorly ventilated passage for a group and a sit time. And the Caving Gear Checklist Generator builds a packing list scaled to trip type, duration, and party size.

Beyond the calculators, the blog and learn section cover cave geology, underground life, rigging and vertical technique, and the history of exploration, and the Caves & Speleothems Museum is a browsable collection of famous caves, the stalactites and stalagmites that decorate them, prehistoric cave art, and show caves open to the public, with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. DeepCave is an independent site, not affiliated with any caving club, guiding outfit, or cave management authority. It is supported by advertising, which is how the tools stay free with no account required. Every result the tools produce — a rope length, a runtime estimate, a layering suggestion, a survey reduction, an air estimate, a gear list — is a general planning aid built on the numbers you enter and on common caving conventions, not a substitute for training, a qualified leader, or your own on-rope judgment. Caving carries real risk; always cave with people who know the system, carry backup light and rope-work skills, and confirm access and conditions with the local caving club or landowner before a trip. If a tool looks off, or there’s a calculator you wish existed, the contact page is the place to say so.