Water and electricity can be a lethal combination if not properly installed.
All of your pond and other outdoor electrical equipment should be properly protected against earth leakage. This also includes any electrically powered tools used outside.
Standing in the excavation presents the risk of the sides collapsing onto you, ensure adequate protection in deep excavations.
Take practical precautions to ensure that nobody inadvertently falls into the excavation.
Do not leave dangerous tools or materials lying around the work site.
It is always advisable to have somebody else at hand, in case you should have an accident.
Pond Liners, Rocks, slabs and other building materials can be very heavy so take great care when lifting or digging and seek assistance when necessary.