SWIM has had entities appear on sub-breakthrough doses, quite often actually. They are usually hard to decipher, but their energy is felt and they sometimes speak (without speaking), more like SWIM can understand them.

At one part during his last journey (35mg's), SWIM saw a humongous long pole reaching towards infinity... it went on forever. An entity of some sorts was there, but completely unknown to SWIM; he just knew and felt that someone or something was there. It told him "hey... you can reach the top, all you have to do is try". SWIM focused all of his energy towards reaching the top, and he made it! It was like being on a rocket... truly incredible. After this, effects subsided and he opened his eyes.