In this talk I will primarily focus on classical infinite distance paths in the hypermultiplet moduli space of type IIB Calabi—Yau compactifications. Along such paths, a large amount of instantons develop an exponentially small action thereby correcting the asymptotic moduli space geometry significantly. These instantons are accompanied by a string that classically becomes tensionless in the limit. I will show that taking into account both, the instanton corrections and light the string, yields a weakly coupled string theory that emerges at the infinite distance point in accordance with the recently proposed emergent string conjecture.

Finally, I will also comment on a similar behaviour in the vectormultiplet moduli space of type I compactifications where D1-instanton corrections cause the emergence of a tensionless and weakly coupled heterotic string thereby providing another example for the relation between instanton corrections and emergent strings.