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We show that the Laser Interferometer Gravitational Wave Observatory (LIGO)is a powerful instrument in the Search for Extraterrestrial Intelligence(SETI). LIGO's ability to detect gravitational waves (GWs) from astrophysicalsources, such as binary black hole mergers, also provides the potential todetect extraterrestrial mega-technology, such as Rapid and/or MassiveAccelerating spacecraft (RAMAcraft). We show that LIGO is sensitive toRAMAcraft of 1 Jupiter mass accelerating to a fraction of the speed of light(e.g. 30\%) from $10 - 100\,$kpc or a Moon mass from $1-10\,$pc. While existingSETI searches can probe on the order of ten-thousand stars for human-scaletechnology (e.g. radio waves), LIGO can probe all 10$^{11}$ stars in the MilkyWay for RAMAcraft. Moreover, thanks to the $f^{-1}$ scaling of RAMAcraftsignals, our sensitivity to these objects will increase as low-frequencydetectors are developed and improved, allowing for the detection of smallermasses further from Earth. In particular, we find that DECIGO and the Big BangObserver (BBO) will be about 100 times more sensitive than LIGO, increasing thesearch volume by 10$^{6}$, while LISA and Pulsar Timing Arrays (PTAs) mayimprove sensitivities to objects with long acceleration periods. In this paper,we calculate the waveforms for linearly-accelerating RAMAcraft in a formsuitable for LIGO, Virgo, and KAGRA searches and provide the range for avariety of masses and accelerations. We expect that the current and upcoming GWdetectors will soon become an excellent complement to the existing SETIefforts.

Searching for Intelligent Life in Gravitational Wave Signals Part I: Present Capabilities and Future Horizons