You must realise that caves are absolutely dark and you are completely lost without a certain lamp. Two types of lamps are used in caves: electric lights and carbide lamps. Electric lights are more simple but a carbide lamp is more certain. Carbide lamps use calcium-carbide which reacts with water and the result is Acetylene gas which is flammable.
HELMET WITH CHIN STRAP - every caver recognizes the fact that caves have uneven walls, ceilings and floors. You will hit your head at some point during a trip. Any helmet should also have a chin strap in order to keep the helmet on your head in the event of a fall. When thinking about wearing a helment, consider this : how important is your head to you?
SMALL PACK - to carry your gear in the cave. It should have good closure so that things don't fall out, and should be rather durable. It shouldn't have zippers - they get clogged with mud and become useless. This pack is made of ballistic nylon which is extremely resistant to abrasion.
CLOTHES – the best is if you have waterproofing overall, but for first times you can use also some old things. Remember that clothes you have in cave will be totaly dirty and may be also ragged.
COMPLETE CHANGE OF CLOTHES - For after the trip. This includes socks, shoes, and underwear! This stays outside the cave. Anything that you take into many caves will be ruined forever. Caves are hard on your equipment, your clothes and you. Other useful items to wear are boots, gloves and kneepads. The boots should be sturdy and provide ankle support. Gloves are very important to protect your hands from the harsh environment found in caves. Kneepads are a must if the cave that you will be exploring requires much crawling along passages with low ceiling. Safety

Caves are potentially hazardous places. In some cases there may be loose rocks, vertical drops or a risk of flooding.
Anyone visiting a cave should leave a written note with details of where they are going and expected time of return. This is known as a "Call Out" and should be left with a reliable person. You should also keep some rules of caving.  Always include experienced cavers in the party.
 Never cave alone.
 Take notice of the local weather forecast and ground conditions of the previous few days, because flooding can happen very quickly and violently.  Have one reliable headlamp for each person. Without light you are lost.
 Take secondary lights, food and first aid kit.
 Have boots, helmets and warm clothes. They are essential.