Hypixel is not a modded server, it is a bungee cord plugin server. I would say the only way to do the in vanilla Minecraft would be with advanced command block skills. I would recommend not doing a two-way tunnel like hypixel has it and instead start with a one-way tunnel.
To keep it basic I would recommend at the starting location to have a repeating command block that /tp @a[r=2] ~ ~5 ~/tp @a[r=2] ~ ~5 ~
to the tunnel which will be five blocks above.
Next, in the tunnel make the entire floor of the tunnel command blocks which trigger on a one-second clock. Put tp @a[r=1] ~1 ~ ~tp @a[r=1] ~1 ~ ~
(put the number next to the "~" of the coordinate point you want to change. Then when they get to the end of the tunnel they should drop 5 blocks. Make the tunnel only one way unless you are really good a dummy scoreboards.