This sign adorns a rather pleasant little boating lake in the coastal resort of Southwold in Suffolk...."Danger .5m water depth". So 0.5m is not that deep really, hence there's no claim to "deep water", just informing about the depth. So it's really for the toddlers and youngsters really, given then drowning can occur in bathwater depths.
It's the generic graphic which is at odds with the message here. Here's someone nervously teetering on the edge looking over, but the implied dept there is at least person height and more like 2m, which is at four times the actual depth and potentially bottomless.
