[Interview excerpt] The Reason you should NEVER approach an U.F.O closer than 30ft, explained by their pilots.

Interviewer: There is a question about your ability to visit us in
physical form. The medium has said that you do not allow your craft
to readily appear to humans because there is an issue of safety that
concerns you. If safety is an issue, is it our safety or the safety of the
craft and crew that concerns you?

Zeta: Both. Of course I am concerned about what happens to the
occupants of the craft. I am also concerned about the safety of the
being which is the craft. I am also concerned with the environment
in which the craft lives. I am also concerned with what may happen
to a human if they were to approach a craft. Many humans would
become instantly unwell, and then they suffer because the frequency
would change their body's ability to understand how to repair itself.

Physical contact between a Zeta and a human would create what
appears to be a burn on the skin of the human. The Zeta explains,
“You cannot touch us, you would be burnt. As you moved closer,
your skin would become burnt because of frequency.”

Zeta: Every entity has etheric template, frequency of etheric
template to interact with human etheric template. Increase in
frequency for the human then translates to physical changes in the
cellular structure, and cellular structure representation of burnt
skin.

Also, the structure of the human’s local consciousness could be
seriously damaged when the human is too near the craft and its
occupants.

Zeta: Your consciousness would fracture because we operate within
an etheric boundary that is much larger than the human. So when we come, the human consciousness, the structure that is held by
frequency which is the physical entity of your container, would
dissipate.

Interviewer: There would be a minimum distance then, I suppose,
that humans should approach?

Zeta: Yes, of course, you would never get, unless there was an
accident, within 30 meters to 50 meters from the craft. The physical
body is unable to cope with the changes.

The Zeta was concerned about the safety of both the beings on the
craft and the humans who may be in the vicinity of the craft. We know that the Zetas breathe a form of oxygen, and they use a
breathing device when they are physically present on earth. They do
not explain what other dangers might threaten the safety of the craft
occupants. Perhaps there are concerns that humans themselves are a
threat given our nature.

They are clear, however, that a landed craft would have a negative
effect on the immediate environment. There would be a danger to
humans as well were they to approach too near a craft. Such effects
would arise from exposure to emissions from the craft and to the
higher vibrational state of the occupants. To avoid negative effects
on the human body, we are advised to stay more than 30-50 meters
away from a craft.

You can find more on Paul Hamden's mediumship and interviews with alien races on my blog.