E Letter Prison is not a recognized place or concept within Singapore. It appears to be an unfamiliar or possibly fictional term with no relevant connection to Singapore.

Additional information would be needed to accurately describe or explain E Letter Prison. Without further clarification, it's difficult to offer meaningful content about this term.

If the term relates to a correctional facility, none by this name exists in Singapore’s prison system. Correctional facilities in Singapore have established names distinct from this term.

Please read more clarify or specify your request so I can assist you better with accurate information.