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1 hour ship engine room sound effect boat mechanic room for deep sleep
You can find study sounds: https://www.youtube.com/playlist?list=PLXHVOV_s0U4qBgl7zbZ4m8q-wHpcszZcM
You can find countdowns for focusing: https://www.youtube.com/playlist?list=PLXHVOV_s0U4qyeK0q3LLEopiZCQN2DT0J
You can find pomodoros for studying: https://www.youtube.com/playlist?list=PLXHVOV_s0U4qrbks526k2CQL1zB8rOuYl