Rescue Rocket is a datapack that adds one new item. The Rescue Rocket.

It can be crafted by throwing a saddle and a firework rocket on the ground. All NBT data will be kept by the resulting Rescue Rocket. (Flight Duration, Effects, Etc.)

When launched, the player will start riding the rocket and be carried high into the air, or you can dismount early. After the rocket dies out, you will gain slow falling until you hit the ground, and regeneration for 5 seconds.

The rocket can also work underground and will teleport the player until it reaches the surface.