The search for the ground state energies, ground state structures and related mechanical and dynamic properties was carried out within DFT with Vienna Ab initio Simulation Package (VASP) code using the projector augmented wave (PAW) method for the atomic potentials with all valence states (especially in regard of such light element as carbon). The exchangecorrelation effects inherent to DFT were considered with the generalized gradient approximation (GGA) following Perdew, Burke, and Ernzerhof . Relaxing the atoms onto the ground state structures was carried out with the conjugate-gradient algorithm . The tetrahedron method was applied for both geometry relaxation and total energy calculations using Blöchl et al. corrections and Methfessel-Paxton scheme . Brillouin-zone integrals were approximated using a special k-point sampling of Monkhorst and Pack . The optimization of the structural parameters was performed until the forces on the atoms were less than 0.02 eV/Å and all stress components below 0.003 eV/Å 3 . The calculations were converged at an energy cut-off of 400 eV for the planewave basis set regarding the k-point integration in the reciprocal space up to 121212 k x ,k y ,k z for the final convergence and relaxation to zero strains. In the post-treatment process of the ground state electronic structures, the charge density projections were operated onto the carbon atomic sites. The elastic constants C ij and the phonon band structures were calculated to assess the mechanical and dynamic stabilities. Calculations of phonon dispersion curves were also carried out to verify the dynamic stability of the novel carbon allotrope. The phonon modes were computed via finite displacements of the atoms off their equilibrium positions to obtain the forces from the summation over the different configurations. The phonon bands along the direction of the Brillouin zone were subsequently obtained using "phonopy" code based on Python language .