You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "how long is a scuba tank hydro good for?" whose answer is five years.
Each document should contain about 30 words, and these documents should contain useful information.

Query: scuba tank hydro test validity
Useful Output:

Doc 1: That's simple. Your cylinder adheres to the 30 month of Visual and 60 month of the Hydrostatic test cycle.
Doc 2: CO2 and SCBA cylinders are typically required to have hydro testing every five years, though some of the newer models now only require the test
Doc 3: An annual visual inspection and a five-year hydrostatic test are required for cylinders. How are these standards mandated and enforced?
Doc 4: Visual Inspection: Scuba cylinders must undergo an internal and external visual inspection every 2.5 years. · Hydrostatic Testing: Every 5 years,
Doc 5: For example, cylinders used in SCBA (breathing apparatus) equipment require hydrostatic testing every 3 to 5 years, depending on where the