What are soundings on tanks and voids during a hidden damage investigation compared to?

Soundings on tanks and voids during a hidden damage investigation are compared to pre-damage soundings and fuel oil water reports because this comparison allows investigators to assess changes that may indicate damage or issues in the tanks or voids. By looking at pre-damage soundings, which reflect the condition of the tanks before any incident occurred, investigators can observe discrepancies in fluid levels or the presence of water, which could signify leaks or breaches that have developed since the last reported measurements.

Fuel oil water reports further aid in this assessment by detailing any accumulation of water within the fuel tanks, which is critical to understanding the integrity of the tank systems. This dual comparison is essential for establishing whether any changes in the readings suggest hidden damage that was not immediately visible or detectable through other means.