What is one of the best Minecraft base build for a secure hidden base on a vanilla pvp server? Give me three different base designs.
Building a secure hidden base in a vanilla PvP server can be a challenge. However, there are several base designs that can provide a high level of security and concealment. Here are three base designs that can work well in a vanilla PvP server:

    1. Underground Base: Building an underground base is a great way to hide from players, as it is nearly impossible to find an underground base without digging for it. To make such a base, dig a hole in the ground deep enough and wide enough to fit the structures that you want in your base. Then, build walls, floors, and ceilings to create a structure.

    2. Floating Base: Building a base on the ocean or in the sky can be a great way to hide from players. To make such a base, use ladders and platforms to build a structure in the sky or on the water. Be sure to use blocks with transparency, such as glass or stained glass, to help camouflage your base.

    3. Underwater Base: Building an underwater base can be a great way to conceal your base from other players. To make such a base, use blocks such as sandstone and prismarine to build a structure beneath the surface of the water. Be sure to use blocks that can withstand the pressure of water, such as stone and cobblestone. Additionally, you may want to use torches and other light sources to help you see inside the base.