: Tethys is a role-playing game supplement for Traveller published by FASA vin 1980.

[1] The supplement is based on the spaceship creation rules originally published in Traveller Book 5: High Guard.

: Tethys was written by Jordan Weisman and was published in 1981 by FASA as a pamphlet, and seven 11" x 17" map sheets.

Perhaps, with a lot of work, it could be usable for miniature play or to provide a platform for a shoot-out in space.

"[1] In the July 1981 edition of Dragon (Issue #51), Tony Watson also questioned the value of the supplement for referees who enjoyed creating their own work: "If the referee is conversant in constructing vessels that the players enjoy and has a sufficiency of such ships, then he probably should not buy these playing aids.