There are numerous deeper caves and high cliffs in the Minecraft's immortal minecraft. And when in these long and deep caves, it is an excellent attempt to generate some safe bases or havens to take;
Re-emerge or recur or respawn. Store those treasures that have been found. Hid from prying monsters and enemies.
Having these safe bases should go a long way to make an indelible difference between life and death when inside a cave in minecraft game. While there are lots of treasures and resources which can be collected inside these impeded caves, there are also lot of adversaries, combatants as well as real monsters prowling their depths. It is likely to be very feasible for even an immortal minecraft player to be overwhelmed by these enemies if utmost care is not taken. It is thus a good idea to also have a sanctuary in this cave to cover and rest as well.
So, there is need to plan very well when going inside some of these caves. And part of the plan is always to take along some items such as the following to create those safe bases when under the ground;
Chests.
Bed or mat to rest and sleep. Furnace to take cook food.
And so on. All these materials are required to help keep undertaking or expedition inside the cave ongoing.
It is also a good idea to take into account creating temporary fishing pond whilst in the cake. Though some minecraft players would prefer to fill their food storage with so many fishes which are good protein that may be consumed quickly, it is way better to accomplish a fish pond to rear fish when on a voyage underground. At the least, the meals storage will be filled up with many other items and you will see enough fish to accomplish the cave expedition.
Still on the facet of fish availability while in the cave, an immortal smp (survival multiplayer) would just dig a hole and fill it with water to improve fish.