The subject of the photos 2 to 5 is described nicely in the article below which appeared in the 17 July 1926 edition of the Thanet Advertiser.
Across the Water: Under the Water.
On Saturday, the employees of Messrs. Claxton & Co., marine engineers, of Ramsgate held their annual outing. To the number of over forty, they made the journey, in motor coaches, to Southend, starting from Ramsgate about 7.30 a.m. The first stop was at Gravesend, where breakfast was served. The party then went on to Southend for dinner, being ferried across the Thames with their transport. They left Southend at about a quarter to ten, the coaches having to make a long detour (the ferry being closed at that hour) to reach the Kentish side of the estuary by means of the Blackwall Tunnel. They arrived at Ramsgate, tired but content, at 3.30 on Sunday morning, having had a long, happy day. Messrs. K., R., and G. Claxton accompanied the party.