Alan de Enfield

Best I have managed is 'low teens' on a shallowish dive - 9 is a cracking figure for a male. Its amazing what some folk can achieve. On the 2 hour dive my Son did, his buddy (instructor) said he'd dive with him on a single 12L - he managed 100 minutes, went onto my sons 'bail out cylinder' for ~10 minutes and used his 12L to surface and still had 'a bit' of air left.

I couldn't without signing in or creating an account.

There are a large number of forum members who do not use faceburk so are unable to view whatever it was that you linked to.

Just a single 15 litre (at 232 bar) or a single 12 litre at 300 bar. When you are training then you are much 'thirstier' on air - 28-30 lites per minute is not unknown but as you become more experienced and diving regularly it will drop to ~18 to 20 litre per minute. Depth has a big effect on consumption as diving at (say) 30 mts is applying 4 atmospheres of pressure so you need to have air provided at that pressure or your lungs will not expand, thus you get thru air quicker. Most of my diving is in the 10-20 metre range as that is generally where the interesting stuff is, down at 30mts its getting dark. No1 son dives with a CCR (closed circuit rebreather) in theory he could easily stay down 6 or 8 hours. He recently had a dive of 100 minutes at 20mts but then had to stop at 9 metres depth for 20 minures to decompress

If they fell forwards they'd smash their face on the deck !

Its not that difficult. I'm the 'wrong side of 70' and a 'bit creaky', but my full scuba dive gear weighs around 50kg (normally ~52kg in sea water and ~48 kgs in fresh water) Its quite easy to walk 100 mts to the waters edge on tarmac tracks, but when diving off a beach you can be walking thru 200+ metres thru sand dunes and soft sand. That certainly gets you sweating a bit. Its a little lighter on the way back (as I will have consumed 3 or 4 kgs of air), however - it is actually much harder to walk back up the beach as you are tired from an hour or so swimming.

If you are unable to find a 'closure' anywhere, allegedly laminated signs are available from the NBTA........................ "Unable to move due to gear box being removed for repair"

I'm struggling to follow this - the bolts on the tow path were exposed - how did this affect boats if they were in the 'trough' ?

These are the ones I have on my sea-going cruiser. Breaking waves rolling over them - not a drip enters the boat.