■How to use a lift bag

Estimate the weight of the recovery object and prepare an optimally sized lift bag.
The size of the lift bag required to recovery the target should be about 1 L per kg of the object.

After attaching the lift bag to the target object with a nylon rope, use a safety second etc. to gradually send air into the lift bag.

When the lift bag rises from the sea floor and the lift bag rope is taut, check the rope knot for looseness.

While watching the sign that the target leaves the the sea floor, fed air into the lift bag gradually until the target becomes neutral buoyancy.

Since movement on the water surface consumes physical strength, when the target object becomes neutral buoyancy, move horizontally near the sea floor to just below the ascent point as long as possible.

When you arrive at the ascent point, keep the ascent speed of the target object at the safety ascent speed of the diver and ascend with the target.

Infusing too much air into the lift bag at one time is dangerous because the object will ascend at an unexpected high speed as soon as it leaves the sea floor.

The air in the lift bag expands as you approach the water surface, so gradually exhaust the air in the lift bag from the exhaust valve and adjust the ascent speed.

If you fail to exhaust the air of the lift bag and the target begins to ascend above the diver's ascent speed, do not chase the lift bag.

In that case, move away from under the target immediately in case the target object falls.