Answer:
[tex]\boxed{\text{-45 m}}[/tex]
Step-by-step explanation:
The surface of the water is at 0 m. Heights above the surface are positive and depths below the surface are negative.
[tex]\begin{array}{cc}\textbf{Stop} & \textbf{Change in Depth/m} \\1 & -25 \\2 & -5 \\3 & -5 \\4 & -5 \\5 & -5 \\\text{TOTAL DEPTH =} & \mathbf{-45} \\\end{array}\\\text{Jessica's depth relative to the surface of the water is $\boxed{\textbf{-45 m}}$}[/tex]