Give them a break, they didn't even have cuneiform dive tables yet, much less computers...
'Dinosaur Bends' Caused by Prolonged Diving
ScienceDaily (Aug. 15, 2012) Dinosaur-like creatures may have injured themselves during leisurely deep-sea diving trips and not from resurfacing too quickly, as previously thought.
ScienceDaily (Aug. 15, 2012) Dinosaur-like creatures may have injured themselves during leisurely deep-sea diving trips and not from resurfacing too quickly, as previously thought.