Handling fibre optic cables can result in skin injury from glass shards, and the risk increases if these are ingested, which can lead to serious internal organ damage.
Chemicals are commonly used to clean or process fibres, and this should only be undertaken in well-ventilated areas.
As sharp and thin as these glass shards are, they can easily penetrate your skin.
And unlike a wood sliver, these glass slivers will not degrade inside your skin.
These cut pieces of fibre are very dangerous.
If they were to end up in your lunch, they could cause internal bleeding and conceivably death.