Multiplayer Techniques

Dual Mining
Dual Mining (aka: Bro Mining) is a quick, effective way of mining straight down that requires at least 2 people.

One player mines on the left side of the pairs feet, while the other mines on the right. This can speed up the rate at which the players descend, but this speed can create issues.

Falling into a pit or lava pool may result in an instant death without fast reflexes and getting out can be tricky without Wood Platforms, a grappling hook or a Lucky Horseshoe. Players may also use water at the end of a tunnel to negate fall damage.

Lighting Issues
Considering the high speed of the mining process, lighting can become an issue. To alleviate these problems there are a few things that can be done.
 * Wear the Mining Helmet
 * Carry a Torch via a third person or occasionally place them within the shaft.
 * Use the Orb of Light
 * Use the Molten Pickaxe

Further Issues
PvP must be off when using this technique, or the miners will end up hitting each other instead of the blocks.