Hatches are a way of inputting and outputting items, liquid, energy, and data from rockets and machines.
There are three main different types of hatches: Fluid, Item, and Energy.
Fluid hatches, when built into a machine provides the capacity for the machine to accept fluids, this is necessary for some recipes
Item Hatches are used to provide a way of getting items into and out of a machine. Most will move an itemstack over if there is room if the output stack cannot fit in the last slot.
Energy Hatches are used to accept or output energy from a machine.
Hatches can be linked directly to a rocket, a rocket assembler, or Docking Pad using a Linking tool.
When linked to a Docking Pad or rocket assembler, any rocket that lands on the Docking Pad or on the landing pad will automatically be linked to the hatches.
When connected to a rocket, hatches will output redstone signals under various circumstances: