  Within the premise of canonical quantisation, we re-examine the quantum
structure of bosonic tensionless string theory. In the classical theory, the
worldsheet metric degenerates and the Bondi-Metnzer-Sachs (BMS) algebra arises
as the residual symmetries on fixing the tensionless equivalent of the
conformal gauge. In the quantum regime, we find, on careful examination, that
there are multiple ways to impose constraints to restrict the physical Hilbert
space, which in turn lead to three distinct choices of tensionless vacua. We
analyse these vacua in detail, commenting on various aspects like the central
charges and the spectrum around each of them.
