Photoemulsions have been irradiated with 4.5A GeV/c Si 28 ions. Events having a number of heavily ionizing particles N h≥ 28, were selected for this study. It is shown that these events represent the complete destruction of Ag (Br) emulsion nuclei into almost individual nucleons without a measurable residual nucleus. The average multiplicities of the different secondary particles emitted in these interactions are compared with the corresponding ones for different projectiles [1]. The probability of complete destruction events is nearly independent of the incident energy and it increases linearly with A B 2/3 up to A B= 12 where it becomes constant. The comparison of theoretical calculations of the average multiplicity of shower particles lang n s rang,