I'm tall, yet my arms are short.

I benefit from something, which can damage others.

I was kept as a secret.

When I was found, people nicknamed me with fear.

What am I?

I'm tall, yet my arms are short.

I move above the water, and it is based on a theory.

I benefit from it, while others don't.

I was made, along with brothers, kept as a secret.

When I was found, people nicknamed me with fear.

What am I?