Tesla knew that the "theory" of relativity is basically bullshit.
Tesla's technology was based upon the truth
and the aether.
Tesla considered his
theory wholly inconsistent with the theory of relativity, and with
the modern theory concerning the structure of the atom and the
mutual interconversion of matter and energy.
attacked the validity of Einsteinís work; and until two or three
years before his death, he ridiculed the belief that energy could be
obtained from matter.
The only statement Tesla has made concerning his principle and his
theory is that contained in the lecture he prepared for delivery
before the Institute of Immigrant Welfare (May 12, 1938). In this he
the succeeding two years [1893 and 1894] of intense
concentration I was fortunate enough to make two far
reaching discoveries. The first was a dynamic theory
of gravity, which I have worked out in all details
and hope to give to the world very soon. It explains
the causes of this force and the motions of heavenly
bodies under its influence so satisfactorily that it
will put an end to idle speculation and false
conceptions, as that of curved space.
. . .
Only the existence of a field of force can account
for the motions of the bodies as observed, and its
assumption dispenses with space curvature. All
literature on this subject is futile and destined to
oblivion. So are all attempts to explain the
workings of the universe without recognizing the
existence of the ether and the indispensable
function it plays in the phenomena. My second
discovery was of a physical truth of the greatest
importance. As I have searched the entire scientific
records in more than a half dozen languages for a
long time without finding the least anticipation, I
consider myself the original discoverer of this
truth, which can be expressed by the statement:
There is no energy in matter other than that
received from the environment. On my 79th birthday I
made a brief reference to it, but its meaning and
significance have become clearer to me since then.
It applies rigorously to molecules and atoms as well
as to the largest heavenly bodies, and to all matter
in the universe in any phase of its existence from
its very formation to its ultimate disintegration.
From: Prodigal Genius, BIOGRAPHY OF NIKOLA TESLA, by John J.
O'Neill, July 1944, [page 216] [PDF page 117-118]