Safety during excavation

Following link from SafetySmart provides tips about safety during excavation.

http://www.safetysmart.com/safetysmart/resources/view.aspx?id=428&articleId=957&utm_source=pardot&utm_medium=email&utm_campaign=Bongarde#.UEdzpbLibRs

There are many more precautions to be taken about safe distances to be maintained for keeping the excavated soil, provision of ladders for use in emergency, display of cautionary signs, etc.

Five workers die as wall collapses

During digging for a cellar under a building, five workers were buried alive due to caving in of adjacent excavated earth of 15 feet high and also collapse of side wall. 

I am unable to provide the link for the picture which I saw in the news paper (Times of India) in local edition that appeared on 13.04.2012 which opens the eyes of careless site engineers who do not bother to keep the excavated soil away from the trenches. As per good safety practices, the excavated soil should be kept atleast 1.5 m or 50% of the depth of the trench whichever is higher. Further, the angle of repose of the soil also should be taken in to account depending upon the nature of the soil/earth excavated. Generally, 15 degree (with horizontal) is the safe angle.
And, shoring as required also needs to be ensured so that there will not be any collapse.  In another incident reported few years ago, two persons working at a depth of about 3-5 feet were buried from the earth adjacent due to disturbance/vibrations caused. 

When people are covered even partially under the soil, it is difficult for them to come out of it and suffer due to the impact and pressure of the soil on their body leading to death. 

http://www.indiablooms.com/NewsDetailsPage/2012/newsDetails130412k.php

http://timesofindia.indiatimes.com/city/hyderabad/Five-workers-die-as-wall-collapses/articleshow/12645263.cms

http://www.thehindu.com/news/cities/Hyderabad/article3310070.ece