Search for Hydra -How long Hydra can remain alive without feeding?

How do we know there is something Hydra or not? How do we create curiosity to explore rather than believing that Hydra isn’t present?
When we just observe for Hydra, they many times compress themselves when they are not fed for long and appear only as a green spot. Can we touch and find out if there are hydra which are alive? Can we see any rod shaped structures and touch them to find out the movement of tentacles? There is a popular myth that Hydra dies, but they may be alive, its we that may be missing to see them.

This is the photo of culture from Seema where Hydra was present.

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