Please polish the following paragraph according to the style of SCI journalsIn the fire test the maximum deformation of the immersed tunnel was only 145mm during the 245min heating process and the def

During the fire test, the maximum deformation of the immersed tunnel was found to be merely 14.5 mm over a 245-minute heating process. Notably, the deformation direction of the immersed tunnel was observed to be opposite to that of the external load. These findings suggest that the bearing capacity of the immersed tunnel under fire was sufficient, thereby preventing severe deformation due to the high temperature of fire. However, despite the structural integrity of the immersed tunnel, the outer surface still exhibited severe cracking during the fire test, as depicted in Fig. 11. As previously analyzed, the uncoordinated thermal strain is the primary cause of this phenomenon, leading to serious cracking of the immersed tunnel even when the bearing capacity is sufficient. The structural characteristics of the immersed tunnel make the thermal expansion inside the tunnel under fire prone to inducing tensile cracking on the outer surface of the immersed tunnel. Given that immersed tunnels are often located deep under the sea, severe concrete cracking can lead to seawater seepage into the tunnel, resulting in a catastrophic disaster. Thus, even if the bearing capacity of the immersed tunnel is sufficient under fire, ensuring the safety of the immersed tunnel remains a challenging task. Therefore, it is imperative to consider the impact of concrete cracking on the safety of the immersed tunnel