Well deep underwater there's plenty of strange life forms

Although a U-boat couldn't really dive deep enough to see an angler.

A quick look at Wikipedia says a Type IX-C like U-511 had a maximum dive depth of 230 meters, while many anglerfish are bathypelagic, and tend to stay around 1000m or more down.

NWSiaCB said:

Although a U-boat couldn't really dive deep enough to see an angler.

A quick look at Wikipedia says a Type IX-C like U-511 had a maximum dive depth of 230 meters, while many anglerfish are bathypelagic, and tend to stay around 1000m or more down.

This is a cybernetically modified child we're talking about, anything is possible.