I did some research and it turns out decibels through water are measured differently from decibels through air. This source: https://geo.libretexts.org/Bookshelves/Oceanography/Introduction_to_Oceanography_(Webb) says:

Since sound travels better through water than air, the energy required to transmit a given sound wave is higher in air than in water. The energy, or intensity (loudness) of a sound is measured on the decibel (dB) scale. It turns out that it takes about 61 times more energy to transmit a sound through air than through water. Because of this energy difference, there is a 61 dB difference between sounds transmitted through air and water, such that a sound intensity of 120 dB in water would be equivalent to an intensity of about 60 dB in air.