Water would in some circumstances actually aid in preservation, especially if the burial was in mud. The fine mud seals out oxygen. Water itself can be deoxygenated, and then also acts like a sealant, keeping atmospheric oxygen away from the artifacts.
World War I was a total disaster, and never should have been allowed to happen. Britain especially had no excuse for getting involved. The result was that hundreds of thousands of young men were killed, and a generation depleted. The loss of morale effected every participating country. Good governments were destroyed, so that in their place socialist dictatorships could arise. More wars then followed. All this was unnecessary.
The leaders of those days were total fools to let this happen. And we see little sign that modern leaders are any smarter.
The true meaning of W. Shakespeare's Romeo and Juliet is WAR: This is what WAR is.
No one even knew what the WAR was about. The two young people in the drama, caught in the tide of history, didn't care a whit what it was about. And the outcome--in Shakespeare's beautiful drama and in real life--is always tragic.