Week 3, Day 16

Today we had a late morning due to our night dive that ended at 1 am. We started off in the classroom and looked at Hazardous Diving. It was interesting and somewhat scary. The biggest killer amongst divers is inshore diving and differential pressure. Diving in canals, dock gates, dams and pipelines are the most hazardous as you are dealing with two different water pressures. Other things to take into consideration are Tides, Currents and Bad Sea states. After looking at these in detail we moved on to diving under ships and things to look out for such as propellers, intakes and diving under the keel of the ships. Basically when you dive under a ship you need to inform the chief engineer and the captain, along with the harbour master. At the same time ensure that all the correct security measures are being followed such as displaying the Alpha Flag and if diving in the evening, having the correct colour light displayed on the side of the ship you are diving on. After class we went down to the pier. The weather was beautiful and we took in as much sun as we could.
At the same time we completed a dive moving an anchor using a lift bag. By adding air to the lift bag using our pneumo, we lifted and moved a heavy anchor down and up the sea bed. I was fun but given that it was Friday we all wanted to complete the dive as fast as possible.