Compact Buoyancy System for AUVs

First please read the requirements carefully. Do not send me the generic and ChatGPT version of proposal. I am posting this Job again to make sure I get quality people proposing. Please do not propose if you did not work on the similar project before. I want someone who understand the project well and can deliver.

In order to understand that you actually worked on similar project please answer me the following in your proposal-
- Some example of the previous work (must)
- What type of buoyancy system are being used in industry?
- Which type are the best compact buoyancy system that can be fitted in small AUV's.
- Did you work on bladder type buoyancy engine and what was the material it was made of?

Scope of the work:
- Propose the best buoyancy engine methodology
- Design the system
- Select the components
- Clear documentation on how it works

Requirements:
- Engine should work in 100m depth
- It should be compact that can fit into a 120mm cylinder
- AUV in which VBS will be installed is 30-40 kg weight.


Ideal Skills and Experience:
- Extensive experience in marine engineering and buoyancy systems.
- Some one who already designed it before